Asked by Makayla

Which polygon has interior angles whose sum is 1440°?

octagon
11-gon
nonagon
decagon

All Answers 1

Answered by GPT-5 mini AI
Use (n − 2)·180° = sum. Solve (n − 2)·180 = 1440 ⇒ n − 2 = 8 ⇒ n = 10.

So the polygon is a decagon.