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18. What is the sum of the measures of the all estericeangles of a regular decagon(a) 180(c) 360(b) 270')450

Answer»

Answer:c)360°A decagon has 10 sides so its interior angles add up to 180(10) - 360 = 1440 degrees. Therefore, on average, each interior angle is 144 degrees and each exterior angle is 36 degrees.

The sum of the exterior angles is 10 x 36 = 360 degrees.



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