Best Answer

Area of a regular polygon equals to the one half of the product of its perimeter with the apothem. So we have:

A = (1/2)(a)(P)

Since our polygon has 10 sides each with length 1.2, the perimeter is 12 910 x 1.2).

Substitute 12 for the perimeter, and 1.85 for the apothem in the area formula:

A = (1/2)(a)(P)

A = (1/2)(1.85)(12)

A = 11.1

Thus, the area of the decagon is 11.1.

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Q: What is the area of a regular decagon whose side is 1.2 and whose apothem is 1.85?

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