Surface area of a sphere

P=4\pi r^2

Result unit: area units

What it describes

The surface area of a sphere with radius

r

P

surface area

r

radius

The surface area of a sphere is four times the area of a great circle of the same radius.

Surface area of balls, planets, spherical tanks.

Radius of the ball

r=3

. Find the surface area.

Substitution

r=3

Result

P=4\pi\cdot9=36\pi\approx113.1

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