A regular decagon has a radius of 8 cm.What is the approximate area of the decagon? Recall that a decagon is a polygon with 10 sides.

For a regular polygon with 10 sides and radius 8 cm, use the area formula A = (n/2)R² sin(360°/n). Substituting gives A = 5 × 8² × sin(36°) ≈ 320 × 0.588 ≈ 188 cm². The approximate area is 188 cm², choice A.

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