Qualababy18: if the point (2/3,y) is on the unit circle, what is y?
The equation for the unit circle is x
2 + y
2 = 1, so if x = 2/3, we have (2/3)
2 + y
2 = 1. We can rearrange this to get y
2 = 1-(2/3)
2,, by taking the square root of both sides we can find y (there will be two values)
solve(y^2=1-(2/3)^2)
+33658 
