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Calculus Precalculus

Peter P.

asked • 05/28/21

Convert (7, -5π/7) to a rectangular coordinate

Convert (7, -5π/7) to a rectangular coordinate

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Raymond B. answered • 05/28/21

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(7, -5pi/7) = (7cos(-5pi/7), 7sin(-5pi/7)) = (-4.37, -5.47)

5p/7 =(5/7)180 = about 128.6 degrees

-128.6 is equivalent to 360-128.6 = 231.4, in quadrant III where sines and cosines are negative. reference angle 231.4-180 = 51.4 degrees

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