The interior angles of a regular polygon can be found using the formula:
interior angle = (n-2) x 180 / n
where n is the number of sides of the polygon.
If we let n = 12,
then the interior angle is:
interior angle = (12-2) x 180 / 12 = 150 degrees
If we let n = 7,
then the interior angle is:
interior angle = (7-2) x 180 / 7 = 128.57 degrees
If we let n = 4,
then the interior angle is:
interior angle = (4-2) x 180 / 4 = 90 degrees
Therefore, the interior angles of regular polygons with 12, 7, and 4 sides are 150 degrees, 128.57 degrees, and 90 degrees, respectively.