Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 5 - No. 5)
If you are given an angle of 150 degrees, what angle should you use to determine its value with your calculator, or using sin, cos, and tan?
150 degrees
30 degrees
-30 degrees
-150 degrees
Explanation
The angle of reference is 30 degrees.
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