Table of Contents
Types of Angles
There are three types of angles: acute, right, and obtuse.
An acute angle is an angle less than 90 degrees.
A right angle is an angle that is exactly 90 degrees.
An obtuse angle is an angle that is greater than 90 degrees but less than 180 degrees.
Acute Angle
An acute angle is an angle that is less than 90 degrees.
Right Angle
A right angle is formed when two lines intersect at a 90° angle. It is a common symbol in geometry, and is often used to indicate perpendicularity.
Obtuse Angle
An obtuse angle is an angle that is greater than 90 degrees but less than 180 degrees.
Straight Angle
A straight angle is an angle that has a measure of 180 degrees.
Reflex Angle
The reflex angle is the angle formed between a line perpendicular to a surface and the surface itself. It is measured in degrees.
Full Rotation
Triple Threat
1. Shoot
2. Drive
3. Spin
4. Pass
5. Cut
6. Post
7. Dribble
8. Fake
9. Rebound
10. Steal
Steps of Construction of 180 Degree Angle
A 180 degree angle can be constructed using a straight edge and a compass.
1. Draw a straight line on a piece of paper.
2. With the compass, draw two circles at each end of the line.
3. Connect the two circles with a straight line.
4. The line will form a 180 degree angle.
Examples of Straight Angle
A straight angle is a line segment where the two endpoints are the same point.
Straight Angle Theorem
The sum of the angles in a triangle is 180 degrees.
Straight Angle Properties
Vertical angles are equal
Angles that are opposite one another are equal
Angles that are adjacent to one another are supplementary
Positive Angle
A positive angle is an angle that is greater than zero and less than 90 degrees.
Negative Angle
A negative angle is an angle that is less than zero.
