I need help please! with area of triangles

- anonymous

I need help please! with area of triangles

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- anonymous

im bad at geometry!

- anonymous

1/2 x Breadth x Height

- anonymous

\[Area_{\Delta} = \frac{1}{2}Base \times Height\]

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## More answers

- anonymous

i know. but i need help solving a question.!

- anonymous

im sorry its base.

- anonymous

post your question here!

- anonymous

Breadth is a decent word for it

- anonymous

ok hold on.

- anonymous

use 1.7 as the value of square root 3. what is the area of equalateral triangle abc in sq. in

- anonymous

what are the lengths of the sides of the triangle?

- anonymous

here ill send a picture.

- anonymous

##### 1 Attachment

- anonymous

Ok, so what is the length of the base?

- anonymous

I don't know..

- anonymous

its equilateral

- anonymous

4?

- anonymous

yes

- anonymous

Ok.

- anonymous

so now we need the height (the length of the blue line through the middle)

- anonymous

how?

- anonymous

pythagoras theorem

- anonymous

Well, we have 2 right triangles described in the middle of that equalateral triangle.

- anonymous

yes.

- anonymous

\[2^{2} + x ^{2} = 4^{?}\]

- anonymous

so the length of the hypotenuse of either of them is 4. and one leg is 2 (half of 4). What is the length of the other leg?

- anonymous

its 2?

- anonymous

\[x = \sqrt{4^{2}-2^{?}}\]

- anonymous

which is sqrt of (16 - 4)

- anonymous

which is sqrt 12.

- anonymous

since sqrt 3 is given by 1.7

- anonymous

yes,

- anonymous

sqrt 12 = sqrt(4x3)

- anonymous

sqrt(4x3) = 2x(sqrt3)

- anonymous

which is 2x1.7 = 3.4, therefore the length is 3.4 and the base 4.

- anonymous

using the formula 1/2 b h = 0.5 x 3.4 x 4.

- anonymous

the answer is 6.8 inches

- anonymous

are u sure

- anonymous

this means you don't understand how it's done!

- anonymous

the more important question is are YOU sure.

- anonymous

Because if you aren't sure, then you have no way to know if holy did it right.

- anonymous

yes.

- anonymous

NO I UNDERSTAND! :) now.

- anonymous

can u guys help me with one more like that?

- anonymous

?

- anonymous

##### 1 Attachment

- anonymous

its the same question as the previous. if you understood you should be able to do this.

- anonymous

since its an equilateral triangle. use the formula to get the length of the triangle.

- anonymous

using the formula \[a ^{2} + b ^{2} = c ^{2}\]

- anonymous

you can find out what is the height/length of the triangle.

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