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Angles (Trigonometry & Precalculus)
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Angles (Trigonometry & Precalculus)

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Grade Level Grades 9-12
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Standards Alignment
State-specific
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About This Lesson

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 .

Resources

Videos
Introduction to radians | Unit circle definition of trig functions | Trigonometry | Khan Academy
Remote video URL
Radian and degree conversion practice | Trigonometry | Khan Academy
Remote video URL
Arc Length of a Circle Formula - Sector Area, Examples, Radians, In Terms of Pi, Trigonometry
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Standards

Understand radian measure of an angle as the length of the arc on the unit circle subtended by the angle.

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