Geometrymedium · Past Paper
The parametric equations of the circle x^2 + y^2 = r^2 are:
Ax = r cos theta, y = r sin theta
Bx = r sin theta, y = r cos theta
Cx = r sec theta, y = r tan theta
Dx = a cos theta, y = b sin theta
✓ Correct Answer: A — x = r cos theta, y = r sin theta
Substituting x = r cos theta and y = r sin theta into x^2 + y^2 gives r^2(cos^2 + sin^2) = r^2.
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