Answer:
The measure of the exterior angle is 15°.
1) d. 120°
2) a. 90°
3) b. 72°
4) e. 60°
Explanation:
The sum of an interior and exterior angle of a polygon is 180°.
Therefore, to find the measure of an exterior angle, subtract the interior angle from 180°:

Therefore, the measure of the exterior angle is 15°.

The formula for calculating the size of an exterior angle of a polygon with n sides is:

1. A triangle has 3 sides, so n = 3. Therefore:

2. A quadrilateral has 4 sides, so n = 4. Therefore:

3. A pentagon has 5 sides, so n = 5. Therefore:

4. A hexagon has 6 sides, so n = 6. Therefore:

Solution:
- d. 120° Triangle
- a. 90° Quadrilateral
- b. 72° Pentagon
- e. 60° Hexagon