The celestial sphere shown at right has radius
9 inches. The planet in the sphere’s center
has radius 3 inches. What is the ratio of the
volume of the planet to the volume of the
celestial sphere? What is the ratio of the
surface area of the planet to the surface area
of the celestial sphere?

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What is the formula for the volume of a sphere?

4/3 pi3 right

4/3 pi r^3

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