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Mathematics 9 Online
OpenStudy (donnie1999):

Help please will fan and medal!

OpenStudy (donnie1999):

OpenStudy (pythagoras123):

2 pi is one complete revolution. 1 pi is half a revolution. 7/4 pi is greater than 1 pi but less than 2 pi, so the desired angle lies in the third quadrant. Hence the reference angle is 7/4 pi - 1 pi = 3/4 pi. |dw:1472736120836:dw| (direction of revolution is anticlockwise)

OpenStudy (pythagoras123):

tan (3/4 pi) = -1. You can verify this with a scientific calculator.

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