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anonymous
 4 years ago
Please find my problem attached.
anonymous
 4 years ago
Please find my problem attached.

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phi
 4 years ago
Best ResponseYou've already chosen the best response.1Do you know trigonometry. If so, find the altitude h of the triangle using sin(72º)= h/6 your figure is a parallelogram (that is what those >> marks tell you), so the top side equals the bottom side. So AB has length 12. AE has length AB/3 = 4 the area of the parallelogram is h*base = h*12 (h from above) the area of the triangle is (1/2)*h*AE= (1/2)*h*4= 2*h (h from above) area of the shaded area = h*12  2*h = 10*h so find h!

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.012*6 =area of the parallelogram 4*6*1/2= area of triangle and I subtracted the triangle from the parallelogram

phi
 4 years ago
Best ResponseYou've already chosen the best response.1pretty close. Except 6 is not the height of the parallelogram. you need the height dw:1328468550292:dw

phi
 4 years ago
Best ResponseYou've already chosen the best response.1trigonometry. the sine of an angle is opposite over hypotenuse dw:1328468701639:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0sorry you looking for 5S..

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0just use calculater..

phi
 4 years ago
Best ResponseYou've already chosen the best response.1looks like you need to learn it

phi
 4 years ago
Best ResponseYou've already chosen the best response.1If you want to learn, here are two short videos that might help http://www.khanacademy.org/video/basictrigonometry?topic=trigonometry he has more, if you like them
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