Question

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Answer 1

Answer:

The exterior angles of a polygon=360°.In a regular polygon all interior angles are congruent.As a result all exterior angles in a regular polygon are congruent.360°/90=40°.

Hope its clear and it helps you

Answer 2

Answer:

Sum of exterior angles=360°

No. of sides=9

Measure of each exteriors angle= 360/9=40° each

Interior angle+Exterior angle=180°........linear pair of angles

Therefore,

Interior angle+40°=180°

Interior angle=140°

Sum of interior angle=140*9......9 sides

1260°