Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §9.1 Polar Coordinates, #28 · Calculus · Parametric & polar

Find the radius of

This problem is about polar equations that give circles.

Find the radius of $r = a cos θ + b sin θ$ . (Multiply by $r$ .)

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §9.1 Polar Coordinates, #28

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