Answer: 162°
Explanation:
Using exterior angle methods,
sum total of exterior angle of polygon = ³⁶⁰/ₙ , where n is the size of the polygon. = ³⁶⁰/₂₀
One exterior angle = 18°.
Now the interior angle = 180° - 18° ( angle on a straight line )
Therefore, the measure of the interior angle = 162°.
Not , Other methods can still be applied.