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Given that (15, -20) is a point on the terminal side of angle O, find sin O.
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Hey,
The point (15, -20) is relative to the origin (0,0). Hence this angle lies in the fourth quadrant…. We have a triangle, whose base is 15, and height is 20.
Therefore, Hypotenuese = 25
Hence, sin O = 20/25 = 4/5 = 0.8
However, since this angle lies in the fourth Quadrant, and sin is -ve there, the answer should be -0.8
Hope that helps
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