A circle with radius r and centred at (0,0) is given parametrically by x = r...

 

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A circle with radius r and centred at (0,0) is given parametrically by x = r cost, y = r sint, 0≤ t ≤ 2. Using the parametric equations, evaluate an appropriate integral to verify that the surface area of a sphere is given by 47². A circle with radius r and centred at (0,0) is given parametrically by x = r cost, y = r sint, 0≤ t ≤ 2. Using the parametric equations, evaluate an appropriate integral to verify that the surface area of a sphere is given by 47².