Mar B.

asked • 03/20/20

If cos Ø = 4/5, find two values angle Ø. 0˚ ≤ Ø ≤ 360˚

1 Expert Answer

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Michael J. answered • 03/20/20

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Cosine is positive in the 1st and 4th quadrants in a coordinate system. You need to first find the reference angle (1st quadrant) by taking the inverse cos(4/5).


Then, you can find the angle in the 4th quadrant by subtracting the reference angle from 360.

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