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Find the reference angle for a. $\theta = 140^\circ$ 

          Find the reference angle for
a. $\theta = 140^\circ$
Find the reference angle for a. θ = 140^∘

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Precalculus with Limits
Precalculus with Limits
Ron Larson 2nd Edition
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Find the reference angle for a. ( heta )=140deg Find the reference angle for =140
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Transcript

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00:01 So i want to find the measure of a reference angle.
00:06 A reference angle is a positive acute angle formed by the terminal side of theta and the x -axis.
00:31 For example, let's say i want to find the reference angle for theta equals.
00:42 120 degrees.
00:45 I'm going to draw my angle theta.
00:49 So 90 and a little bit more, i'm going to be in quadrant 2.
00:53 So here's theta is 120.
00:56 The reference angle, i just go to the terminal side, and i come down to the x -axis.
01:03 The reference angle is just 60 degrees, because i'm 60 degrees away from the x -axis...
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