Answer:
150 degrees.
Explanation:
So every polygon's interior angles will always add up to a multiple of 180 degrees depending on the amount of sides, if it's a regular polygon all interior angles will be the same.
(3 sides = 180 degrees, 4 sides = 360 degrees, 5 sides = 540 degrees etc.)
12 sides will always add up to 1800 degrees.
1800 / 12 = 150
Therefore, each interior angle is 150 degrees.