This document defines and describes different types of angles. It states that a right angle measures 90 degrees, an acute angle measures between 0 and 90 degrees, and an obtuse angle measures more than 90 degrees but less than 180 degrees. It also defines complementary angles as having a sum of 90 degrees, supplementary angles as having a sum of 180 degrees, and bisected and vertical angles formed by intersecting lines. A linear pair consists of two adjacent angles with noncommon sides, while opposite rays share an endpoint and are collinear.

1. Angles in Life ProjectBy Bruce Olson

2. Right Angle: An angle is a right angle if and only if its measure equals 90 degrees

3. Acute Angle: An angle is acute if and only if its measure is between 0 and 90 degrees

4. Obtuse Angle: An angle is obtuse if and only if its measure is more than 90 degrees and less than 180 degrees

5. Complementary Angle: Two angles with measures that have a sum of 90 degrees

6. Supplementary Angles: Two angles with measures that have a sum of 180 degrees

7. Bisected Angle: An angle that is divided by a ray into two congruent angles

8. Vertical Angle: Two nonadjacent angles formed by two intersection lines

9. Linear Pair: A pair of adjacent angles with noncommon sides that are opposite rays

10. Opposite Rays: Two rays determined by choosing a point on a line. Thus, these rays share a common end point and are collinear