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Dallasb22
Group Title
What is the area of a right triangle with
Side a: 5√2
Side b: 4√2?
 one year ago
 one year ago
Dallasb22 Group Title
What is the area of a right triangle with Side a: 5√2 Side b: 4√2?
 one year ago
 one year ago

This Question is Closed

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
I got 10.. Formula to find right angle: A=1/2BH
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
find the side and then use use heros formula.
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
side c.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
You mean to find C?
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
So i use: 5√2^2+4√^2=C^2
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
by using pythagourus theorm
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
So i do √18
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
thats 3redical2=c
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
2sides are in radical then 3rd should be also in radical. do you know radical mean?
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Yes the X√x right?
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
yes great.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
So it would be 9√2^2?
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
\[18=\sqrt{3*3*2}\] \[18=\sqrt{9*2}\] u know the square roof of 9 is 3 then \[18=3\sqrt{2}\]
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Ok. So C=3√2
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
What is the Hero's formula?
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
therefor c=3redical2
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
A=5√2, B=4√2, C=3√2
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
do you know about Hero's formula ?
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
If it's a right triangle, you don't need Heron's formula . . .
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
I don't know Heron's formula. And yes, it is a Right Triangle
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
Multiply a×b then divide by 2.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Nice of you to join us, Cliff
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
*salutes* Heron's formula is general for any kind of triangle where you don't feel like using trigonometry to find the height. It requires that you know all three sides first, so often, you'll need trigonometry anyway.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
5√2 * 4√2= 40 40/2= 20
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
QED. Good job.
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
yes i am in that i am talking about Hero's formula not herons.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Okay, good to know, i googled Heron's formula. Hero formula=Heron's formula
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
Same guy. Heron is another name for Hero of Alexandria (en.wikipedia.org/wiki/Hero_of_Alexandria)
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
ok me too.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
I also, noted down Heron's formula for later use :D So the area: 20?
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Thanks Muhammad !
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Thanks cliff!
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
I have another question if one of you don't mind
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
its ok bro. u r welcome.
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
bro look at here what is says http://www.mathsisfun.com/geometry/heronsformula.html
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
Heron's formula is pretty cool, but I prefer using the Law of Sines and Law of Cosines better (provided you know at least 1 angle.
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
Step 2: Then calculate the Area using:
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
means we were dong right or wrong?
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
i was doing without angles.
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
Area of any triangle is half the product of the base and height. For a right triangle, the two perpendicular legs are the base and height.
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
its easy for @Dallasb22
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
ok lets see by using herons formula.
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
Actually, you were doing it with angles because you saw the right angle and used Pythagoras' theorem for the third side (which was unnecessary).
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
Be my guest. Heron's formula is a beast and not worth my time.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Yes, receiving the third side is only necessary if we use Heron's formula.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Correct?
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
and if it wasn't a right angle, then you'd have to use law of cosines or law of sines to find the third side, and if you're going to use trig anyway, might as well solve for the height instead (which is easier) and you still don't need Heron's formula.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
@CliffSedge Another right triangle, A=2√3 c=4 What do i do here?
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Ah true, Cause 1/2BH=Area
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
I'd still only need base and height.
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
If you now have a leg and the hypotenuse, use PT to find the other leg then same as before.
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
As a fun exercise just to practice some arithmetic, you can use Heron's formula to verify the area, or viceverse.
 one year ago

muhammad9t5 Group TitleBest ResponseYou've already chosen the best response.0
what are the answers of 1st question?
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Okay, so 2√3^2+b^2=4^2 6+B^2=16
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
@muhammad9t5 Answer for Q1 is 20
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
So i subtract 6 to both sides B^2=10
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
mm, something doesn't look right there..
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
They want my answer to be x√x
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
I think you forgot to square the 2 in (2√3)
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Ahhhh. Thats my PROBLEM!!!
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
So it'd be 4√9 = 12
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Side B= 2
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
So I would multiply A and B 2√3 * 2 =X x/2=Area?
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Giving me an area of: 4√3
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
did you divide by 2?
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Ah man. *facepalm*
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
2√3 IS the area
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
Math teaches us to be precise and methodical, yes?
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Hehe, yes it does.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
I have 2 more if you don't mind.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
They should be easy, they are equilateral.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
I just am doing something wrong that I can't find..
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
And remember, that is more important than any particular kind of math problem. It's the problemsolving attitude, the patience, the planning, that is more important than whether or not you can solve this or that equation.
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
Wanna take this equilateral triangle, muhammad? I'm going to take a coffee break.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Yes, i know what you mean. If you didn't catch me I would have gotten it wrong, because I was rushing.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
All three sides: 5, so the perimeter: 15 What is the area?
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Equilateral triangle area formula: √3/4 * (s^2)
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
So √3/4 * (25)
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
I get: 25√3/4
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
dw:1347039793370:dw
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
But i cannot insert that in my work, i can only enter x√x
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
hmm, I'm getting something different. I'm going to doublecheck my work. In the meantime, if you forget the equilateral triangle formula, you can rederive it using (what else?) Pythagoras' theorem. dw:1347039924563:dw
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
But what use is PT, if all side's are equal?
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
To solve for the height of the triangle, which you need for the general triangle area formula.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Okay.. So the height is 25? 25+25=25 50=25 25
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Wait.. I did that wrong.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
dw:1347040273270:dw
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
IF the sides are all 5, then AB is 2.5
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
So how do i put 2.5 into PT?
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
dw:1347040269678:dw \[(S/2)^2+h^2=S^2 \rightarrow h^2=S^2S^2/4 = 3S^2/4\]
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
Half of 5 is (5/2). (5/2)^2 = 25/4. (tip: fractions are better than decimals when doing algebra)
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
I doublechecked. Your original formula and answer were correct.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
How could that be?
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
How could what be?
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
25√3/4 is the answer?
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
Yep. If wherever you are submitting these answers doesn't like it in fraction form, then convert 25/4 into a decimal.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Being 6.25?
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
Yes. 2.5^2 = 6.25 just like 25^2 = 625.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
But wait.. Something is wrong, because they want my answer as: x√x
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
And 6.25√3 is no good?
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Darn, there i go again I forgot we were only simplifying the 25/4
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
I kept including the 25√3
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
I included the radical in the the division...
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
So its 25/4√3 Or 6.25√3
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Your Score: 100.0% Thanks Cliff.
 one year ago

Dallasb22 Group TitleBest ResponseYou've already chosen the best response.0
Those 2 were the only ones I was having trouble with.
 one year ago

CliffSedge Group TitleBest ResponseYou've already chosen the best response.1
My pleasure. They're all just puzzles. Keep looking until you find where all the pieces fit.
 one year ago
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