Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §14.2 Change to Better Coordinates, #1 · Multivariable Calculus · Change of variables

What is the area of

R is a pie-shaped wedge: $0 ⩽ r ⩽ 1$ and $π /4 ⩽ θ ⩽ 3 π /4$ .

What is the area of $R$ ? Check by integration in polar coordinates.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §14.2 Change to Better Coordinates, #1

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