An acute angle measures less than 90 degrees, a right angle equals 90 degrees, and an obtuse angle is greater than 90 degrees. A straight angle is 180 degrees. Complementary angles sum to 90 degrees, supplementary angles sum to 180 degrees, and bisecting angles split an angle in half with equal measurements. Vertical angles are non-adjacent angles formed by intersecting lines that have the same measurement, while a linear pair consists of two angles whose measurements sum to 180 degrees.

2. Acute Angle An acute angle is an angle with the measurement of less than 90 degrees.

3. Right Angle A right angle is an angle with the measurement of exactly 90 degrees.

4. Obtuse Angle An obtuse angle is an angle with the measurement of more than 90 degrees.

5. Straight Angle A straight angle is an angle with a measurement of exactly 180 degrees.

6. Complementary Angle A complementary angle is the sum of two angles’ measurements that must equal 90 degrees.

7. Supplementary Angle A supplementary angle is the sum of two angles’ measurements that must equal 180 degrees.

8. Bisecting Angle A bisecting angle is an angle that is split in half, therefore the measurements of both angles are the same.

9. Vertical Angle A vertical angle is an intersection of two lines and the non- adjacent ends are vertical angles. Vertical angles also have to same measurement.

10. Linear Pair A linear angle is when there are 2 lines and one of those lines stop at the other line so that they don’t intersect. The measurement must add up to 180 degrees.