Question

Please answer this correctly

Answer 1

A decagon is a 10-sided polygon, with 10 interior angles, and 10 vertices which is where the sides meet. A regular decagon has 10 equal-length sides and equal-measure interior angles. Each angle measures 144° and they all add up to 1,440° .

Answer 2

The sum of the interior angle of a regular polygon of 10 sides

= 10[180-(360/10)]

= 10 × (180-36)

= 10 × 144

= 1440 degree .

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