C = 2(pi) r
circumference of a sphere = 2*pi*radius or pi*diameter
(Any circular circumference is the same for a perfect sphere.)
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4*pi*r2. because surface area is equal to circumference of circle.
Circumference = π * Diameter
The diameter joins together the circumference of the sphere and it passes through the center of the sphere.
The circumference.
The angles around the circumference of a sphere add up to 360 degrees.