Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §9.1 Polar Coordinates, #27 · Calculus · Parametric & polar

(a) Multiply … by … to convert into an … equation

This problem is about polar equations that give circles.

(a) Multiply $r = cos θ + sin θ$ by $r$ to convert into an $x y$ equation. (b) Rewrite the equation as $(x - \frac{1}{2})^{2} + (y - \frac{1}{2})^{2} = R^{2}$ to find the radius $R$ . (c) Draw the graph.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §9.1 Polar Coordinates, #27

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