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Coterminal angles

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Grade 11 Pre-Calculus Mathematics (30S)
Develop trigonometric reasoning
7. Demonstrate an understanding of angles in standard position from 0° to 360°
7.2 Coterminal angles

Coterminal Angles

See how coterminal angles share a terminal side, apply the coterminal angle formula, and find angles between 0 and 360 degrees quickly.


What You'll Learn

Coterminal angles are angles in standard position that share the same terminal side, even though their measures differ by a multiple of 360 degrees
The coterminal angle formula is theta plus 360 times k in degrees, or theta plus 2 pi times k in radians, for any integer k
To find a coterminal angle between 0 and 360 degrees, keep adding or subtracting 360 until the result lands in that range
Every angle has infinitely many coterminal angles, including both a positive and a negative one
Coterminal angles always share the same reference angle and the same sign pattern given by the ASTC rule

What You'll Practice

1

Finding positive coterminal angles for given standard angles

2

Finding negative coterminal angles for given standard angles

3

Writing general expressions using θ + 360n° where n is any integer

4

Sketching coterminal angles on the coordinate plane

Why This Matters

Coterminal angles are essential in trigonometry and calculus for understanding periodic functions and solving equations with infinite solutions. You'll use this concept when working with sine, cosine, and other trig functions throughout advanced math courses.

This Unit Includes

2 Video lessons
Practice exercises
Learning resources

Skills

Coterminal Angles
Standard Position
Terminal Arm
Angle Rotation
Trigonometry
360° Multiples
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