anonymous
  • anonymous
Please find my problem attached.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
phi
  • phi
Do 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
  • anonymous
i got 60cm^2

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phi
  • phi
how?
anonymous
  • anonymous
12*6 =area of the parallelogram 4*6*1/2= area of triangle and I subtracted the triangle from the parallelogram
phi
  • phi
pretty close. Except 6 is not the height of the parallelogram. you need the height |dw:1328468550292:dw|
anonymous
  • anonymous
how to I find that?
phi
  • phi
trigonometry. the sine of an angle is opposite over hypotenuse |dw:1328468701639:dw|
anonymous
  • anonymous
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anonymous
  • anonymous
sorry you looking for 5S..
anonymous
  • anonymous
i dont know any trig
anonymous
  • anonymous
just use calculater..
phi
  • phi
looks like you need to learn it
anonymous
  • anonymous
42.8=shaded area
phi
  • phi
@cinar, are you sure?
anonymous
  • anonymous
sorry guys
anonymous
  • anonymous
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anonymous
  • anonymous
57.06=shaded area
phi
  • phi
If you want to learn, here are two short videos that might help http://www.khanacademy.org/video/basic-trigonometry?topic=trigonometry he has more, if you like them

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