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Radians. Definition A radian is the angle that is subtended (cut out) at the center of the unit circle when the radius length and the arc length are equal.

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Presentation on theme: "Radians. Definition A radian is the angle that is subtended (cut out) at the center of the unit circle when the radius length and the arc length are equal."— Presentation transcript:

1 Radians

2 Definition A radian is the angle that is subtended (cut out) at the center of the unit circle when the radius length and the arc length are equal. Unit circle – what’s that?

3 Definition A unit circle is a circle of radius 1. Okay, what’s the circumference of a unit circle?

4 Visualization

5 The Unit Circle

6 Conversions

7 To convert Degrees into Radians multiply by To convert Radians into Degrees multiply by

8 1) Change 140º to Radians. 2) Change to degrees Usedegree to rads. Userads to degrees Practice

9 Challenge How are the unit circle and SOH CAH TOA related?

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