<PRE><B>Question 857251</B>
The point P is on the unit circle. Find P(x,y) from the given information. The x coordinate of P is 4/5 and P is in Quadrant I. 
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Since the point is on the circumference of a unit circle,
x^2 + y^2 = 1
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Your point is ((4/5),y) and y is positive
(4/5)^2 + y^2 = 1
y^2 = (25/25)-(16/25)
y^2 = 9/25
y = 3/5
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Cheers,
Stan H.
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