Because many applications involving circles also involve a rotation of the circle, it is natural to introduce a measure for the rotation, or angle, between two rays (line segments) emanating from the center of a circle. The angle measurement you are most likely familiar with is degrees .
Angles (Trigonometry & Precalculus)
Subject
Math — Mathematical Functions
Grade Level
Grades 9-12
Attributes
Standards Alignment
State-specific
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Introduction to radians | Unit circle definition of trig functions | Trigonometry | Khan Academy
Radian and degree conversion practice | Trigonometry | Khan Academy
Arc Length of a Circle Formula - Sector Area, Examples, Radians, In Terms of Pi, Trigonometry
Standards
Understand radian measure of an angle as the length of the arc on the unit circle subtended by the angle.
