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What is the area of the shaded region.Round to the nearest tenth.
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What is the area of the shaded region.Round to the nearest tenth.

What is the area of the shaded region.Round to the nearest tenth.-example-1
User Glade Mellor
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The area of the circle is
Area = π·r² = π·(10 cm)² = 100π cm²

The area of the regular pentagon is
Area = (5/2)sin(72°)·(10 cm)² = 250·sin(72°) cm²

The shaded area is the difference of these:
(100π -250sin(72°)) cm² ≈ 76.4 cm²
User Ysrb
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