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Find the missing coordinate of P, using the fact that P lies on the unit circle in the given quadrant.
a) P( ,-15/17) Quadrant IV
b) P(2/5, ) Quadrant I
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Part (a)
The point is P(x,-15/17), and it lies on the unit circle. x is the unknown x-coordinate.
It means that
+ = ,
+ = 1
= 1 - = = ,
x = = +/- .
Since the point is in Quadrant IV, x-coordinate is positive.
Therefore, the ANSWER is x= : the missed coordinate is .
Solved.
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Solve part (b) in the same way.
You may report me about your progress.
If you do, please refer to the ID number of this problem, which is 1192566.