Question 1015613
The point P is on the unit circle. Find P(x, y) from the given information.
The y-coordinate of P is -1/9, and the x-coordinate is positive. 
---------------
The unit circle is {{{x^2 + y^2 = 1}}}
Sub -1/9 for y
{{{x^2 + 1/81 = 1}}}
{{{x^2 = 80/81}}}
{{{x = 4*sqrt(5)/9}}}