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Mathematics 9 Online
OpenStudy (anonymous):

Help with trig unit circle (pic attached)

OpenStudy (anonymous):

OpenStudy (mathmale):

If we are given the point (x,y) on a circle of radius 1, then x and y MUST satisfy the equation of a circle: x^2 + y^2 = r^2 (where r-1 in this case). So you could check each point given to see whether or not its coordinates satisfy the above equation.

OpenStudy (mathmale):

Hint: what is (6/7)^2? What is (Sqrt(13)/7)^2?

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