A regular decagon has a radius of 8 centimeters 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 (from the center to a vertex), use area = (n/2)r² sin(360°/n). Substituting gives area = 5 × 8² × sin 36° ≈ 320 × 0.588 ≈ 188 cm². So the approximate area is 188 cm², choice C.

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