Co-terminal and Reference Angles

The video tutorial covers graphing angles in standard position, focusing on reference, principal, and co-terminal angles. It explains how to measure angles in degrees, determine reference angles, and calculate principal angles. The tutorial also explores co-terminal angles, providing a general formula for finding them. Additionally, it includes examples of graphing negative angles and more complex angle scenarios.

What is the primary focus of today's lesson?

• Understanding calculus concepts

• Graphing angles in standard position

• Graphing angles in radians

• Solving algebraic equations

When graphing a positive angle of 120°, in which direction should the arm be rotated?

• Horizontally

• Vertically

• Counterclockwise

• Clockwise

What is the reference angle for a 120° angle?

• 90°

• 60°

• 45°

• 30°

How is a co-terminal angle related to the original angle?

• It is always 360° more

• It is always 90° more

• It shares the same terminal arm

• It is always 180° less

What is the principal angle for a -200° angle?

• 160°

• 200°

• 20°

• 180°

For a 390° angle, what is the reference angle?

• 30°

• 90°

• 120°

• 60°

What is the principal angle for a 390° angle?

• 30°

• 60°

• 90°

• 120°

How do you calculate a co-terminal angle for a 390° angle?

• Add or subtract 720°

• Add or subtract 360°

• Add or subtract 180°

• Add or subtract 90°

What is the reference angle for a 440° angle?

• 80°

• 100°

• 40°

• 120°

What is the general formula for finding co-terminal angles?

• Initial angle ± 720°

• Initial angle ± 360°

• Initial angle ± 180°

• Initial angle ± 90°