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anonymous
 one year ago
How do you find the area of this triangle?
anonymous
 one year ago
How do you find the area of this triangle?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1438116778704:dwI need to find the area of this. How do I do that?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1438116845340:dw I forgot the right angle

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1438116970196:dw What about that part? WHen they ask find the area which triangle am i finding it for exactly?

phi
 one year ago
Best ResponseYou've already chosen the best response.2You found the area of the triangle. we can prove it

ChillOut
 one year ago
Best ResponseYou've already chosen the best response.0You're finding the are for the full lines one.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I found the area of which triangle?

ChillOut
 one year ago
Best ResponseYou've already chosen the best response.0dw:1438117079817:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ooh, so the dw:1438117132170:dw is giving me the height for the triangle?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Since I am taking geometry during summerschool I expected it to be some complicated formula. At first I ruled out that it could be that...

ChillOut
 one year ago
Best ResponseYou've already chosen the best response.0There are other formulas involving angles and stuff. But leave that for later :)

phi
 one year ago
Best ResponseYou've already chosen the best response.2here is a proof. We assume we know the area of a rectangle is width * height dw:1438117298679:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So if I answer using 1/2BxH on a graded assessment it will be correct?

phi
 one year ago
Best ResponseYou've already chosen the best response.2now put in a diagonal. the two triangles are congruent, so the area of each is 1/2 of the rectangle'sdw:1438117369207:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So if I answer using 1/2BxH on a graded assessment it will be correct?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0They're not expecting a different method?

phi
 one year ago
Best ResponseYou've already chosen the best response.2now make an obtuse triangle dw:1438117452871:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@phi Ooh, I see. That makes sense...

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ooh. C is the height of dw:1438117583062:dw

phi
 one year ago
Best ResponseYou've already chosen the best response.2if we subtract of the small triangle on the left we are left with the obtuse triangle that is \[ \frac{1}{2} (a+b)\cdot c  \frac{1}{2} b c \\\frac{1}{2} ac + \frac{1}{2} bc  \frac{1}{2} bc \\ =\frac{1}{2} ac \]

phi
 one year ago
Best ResponseYou've already chosen the best response.2hopefully you can follow the logic

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I can, so you just proved 1/2BxH right?

phi
 one year ago
Best ResponseYou've already chosen the best response.2yes, that the formula works for obtuse triangles.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ok thanks. Can I ask another quick question?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0How do you find the area of a kite?

phi
 one year ago
Best ResponseYou've already chosen the best response.21/2 the product of the diagonals http://www.mathopenref.com/kitearea.html

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Would the diagonals be these? dw:1438117923899:dw

phi
 one year ago
Best ResponseYou've already chosen the best response.2the "crossbars" dw:1438118022805:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ooh, ok sorry but: dw:1438118151545:dw It would be 1+1 x 2 + 3/2 right? @phi

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0OOps I mean 1+2 x 3+3/2

phi
 one year ago
Best ResponseYou've already chosen the best response.2it would be except that would not be a kite (the diagonals of a kite bisect each other) see http://www.coolmath.com/reference/kites

phi
 one year ago
Best ResponseYou've already chosen the best response.2correction: the longer diagonal bisects the shorter diagonal

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ooh, so what i said was right? I have a problem asking for the area where they give me the length of half of both lines.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Like they give me this...

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1438118486114:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I just add the 2's and 1's and use the 1/2bxh formula right?

phi
 one year ago
Best ResponseYou've already chosen the best response.21/2 d1 * d2 (though you can think of the diagonals as the width and height)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ooh, thank you so much!!!!!!!!!!!!!!
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