9. which of the following do you need to know to determine the surface area and volume of a sphere?
a. the radius of the sphere
b. the eccentricity of the sphere
c. the circumference of a great circle on the sphere
d. the radius and eccentricity of the sphere

A: radius of the sphere

Step-by-step explanation:

The formula for surface area is A = 4πr^2

With r being the radius and A the surface area.

For volume it is

V= (4/3)πr^3

step-by-step explanation:

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