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# Word Problems/finding area word problem

cito wrote at 2012-11-19 10:53:17
first, divide the pentagon into 5 isosceles triangles. the length of the two equal sides of each triangle is equal to the radius of the circle.

second, compute the total angle which is 360 degrees by the number of sides of the polygon..i.e. 360/5 = 72 degrees.

third, compute the area of one triangle using the formula involving two sides and an included angle. i.e. A = 1/2(9)(9)sin(72deg)

then, Area of pentagon is equal to area of one triangle multiplied by the number of sides of the polygon.

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