Answer:

12.

Each exterior angle = 360 / 5

Each exterior angle = 72°

So angle d = 72°

13.

Sum of interior angles = (n-2)×180

n = 6, since polygon is a Hexagon or has 6 sides,

Sum of interior angles = (n-2)×180

Sum of interior angles = (6-2)×180

Sum of interior angles = (4)×180

Sum of interior angles = 720°

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