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xRAWRRx3
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In triangle BAC, AD is perpendicular to BC, AB = 6 times the square root of 2, and DC = 2BD. What is the area of triangle ADC?
 2 years ago
 2 years ago
xRAWRRx3 Group Title
In triangle BAC, AD is perpendicular to BC, AB = 6 times the square root of 2, and DC = 2BD. What is the area of triangle ADC?
 2 years ago
 2 years ago

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xRAWRRx3 Group TitleBest ResponseYou've already chosen the best response.0
dw:1338085605509:dw
 2 years ago

pfenn1 Group TitleBest ResponseYou've already chosen the best response.1
The interesting thing about a 454590 triangle is that if the sides are of length x, then the hypotenuse is x times the square root of 2. So for the triangle ABD, if the hypotenuse is 6 times the square root of 2, what is the length of AD and BD?
 2 years ago

pfenn1 Group TitleBest ResponseYou've already chosen the best response.1
dw:1338086273824:dwTrue, but what is the value of x?
 2 years ago

xRAWRRx3 Group TitleBest ResponseYou've already chosen the best response.0
OH. IT'S SIX.
 2 years ago

pfenn1 Group TitleBest ResponseYou've already chosen the best response.1
Right! So can you now calculate the area of the triangle ABC?
 2 years ago

xRAWRRx3 Group TitleBest ResponseYou've already chosen the best response.0
But one question, how do we know that BD and AD are congruent? ._.
 2 years ago

xRAWRRx3 Group TitleBest ResponseYou've already chosen the best response.0
OH. BECAUSE IT'S AN ISOSCELES TRIANGLE BECAUSE THE BASE ANGLES ARE CONGRUENT RIGHT?! :D
 2 years ago

xRAWRRx3 Group TitleBest ResponseYou've already chosen the best response.0
I forgot, my bad xP
 2 years ago

pfenn1 Group TitleBest ResponseYou've already chosen the best response.1
Remember the angles of a triangle always have to add up to 180, so 180(45+90)=45
 2 years ago

xRAWRRx3 Group TitleBest ResponseYou've already chosen the best response.0
OH. SO IS THE ANSWER 54?! :D
 2 years ago

pfenn1 Group TitleBest ResponseYou've already chosen the best response.1
Area of a triangle =1/2 height by base\[A=\frac12(6)(12)=?\]
 2 years ago

xRAWRRx3 Group TitleBest ResponseYou've already chosen the best response.0
oh right. :o i forgot it was just triangle ADC.
 2 years ago

xRAWRRx3 Group TitleBest ResponseYou've already chosen the best response.0
so is it 36 then!? :o
 2 years ago

xRAWRRx3 Group TitleBest ResponseYou've already chosen the best response.0
OMG THANK YOU THANK YOU THANK YOU THANK YOU THANK YOU :D YOU'RE A LIFESAVER. YOU HELPED ME SO MUCH X)
 2 years ago

pfenn1 Group TitleBest ResponseYou've already chosen the best response.1
You're very welcome. It is great to memorize the tricks of a 454590 triangle and a 306090 triangle. Nice shortcuts. This is a great website for this:http://library.thinkquest.org/20991/geo/stri.html
 2 years ago

xRAWRRx3 Group TitleBest ResponseYou've already chosen the best response.0
okay, thank you SO much x)
 2 years ago
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