Posted by Katie on Wednesday, June 13, 2012 at 4:21pm.
Look at one of the five isosceles triangle
each has a 72 degree angle with sides of 10 containing that angle.
Use the cosine law to find the base of that triangle
x^2 = 10^2 + 10^2 - 2(10)(10)cos 72
x = ...
Once you have that, find the area of the triangle (1/2)(10)(10sin(above angle)
then multiply by 5
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