finding surface area

also in the form of pi an regular numbers

Surface area is calculated by adding together the area of each of the sides. The cylinder has 3 sides, two circular bases and 1 rectangle.

Area of cirlce = pi*(d/2)^2 = pi * (16/2)^2 = pi *8^2 = 64 pi

Area of rectangle = pi*d*h = pi* 16 * 40 = 640 pi

Surface area = 2* area of circle + area of rectangle

Surface area = 2 * 64 pi + 640 pi = 128 pi + 640 pi = 768 pi

thank you very much may i ask 1 more question ?

If it is a short one.

volume of a sphere with radius of 36.

Volume of a sphere is an equation that you will need to memorize.

Volume of a sphere =4 / 3 * pi * r^3

V = 4/3 * pi * 36^3

V = 4/3* 46656*pi

V = 62208 pi

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