Find the missing coordinate of P, using the fact that P lies on the unit circle in the given quadrant. P(____, -20/29) quadrant IV

Question

Find the missing coordinate of P, using the fact that P lies on the unit circle in the given quadrant.

P(7/8,____)quadrant I

Answer 1

P(21/29, -20/29) in Q4

P(7/8, sqr15/8) in Q1