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What is the surface area of a regular pentagon that has a perimeter of 37.5 cm?
Wiki User
∙ 6y ago
The 5 sided regular pentagon will consist of 5 congruent isosceles angles with equal sides of 6.379881063 cm by using the sine rule and 2 equal base angles of 54 degrees with an apex angle of 72 degrees opposite side 7.5 cm
Area of the pentagon: 0.5*6.379881063^2 *sin(72)*5 = 96.77685379 square cm
Wiki User
∙ 6y ago
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The boy had to find the area and perimeter of the pentagon.
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There can be no such formula in general. A formula will exist if the area is a regular polygon (or a circle).
What is the area of a regular pentagon with perimeter 75m?
About 387 m^2 1.72*s^2 s=perimeter/5 s=75/5=15 1.72*15*15=387
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