For the circle x + y = r: Circumference 2πr If θ is an angle in standard position whose terminal ray passes through P(x, y) on the circle, then: sin θ = cos θ = tan θ = y/x sin²θ + cos²θ = 1 180 degrees = π radians [e^(x,y)]
Added by Enrique M.
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The equation of the circle should be written as $x^2 + y^2 = r^2$. Show more…
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