Subjects/Calculus II/Polar coordinates/Polar areaSection 13.2Polar areaFormulaCopy LaTeXA=21∫αβr(θ)2dθ.View detail →Between two curves, with rext≥rint:Copy LaTeXA=21∫αβ[rext(θ)2−rint(θ)2]dθ.View detail →