Question

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Answer 1

Answer:

$angle \: a \: = 36 \: degree \\ angle \: b \: = 144 \: degree$

Step-by-step explanation:

A decagon is a 10-sided polygon, with 10 interior angles, and 10 vertices which is where the sides meet.

Each angle measures 144° and they all add up to 1,440°

So , angle b = 144°

Therefore ,

angle a = ( 180° - angle b ) = ( 180° - 144° ) = 36°

Answer 2

I hope this helps you...