What is the difference between the formula of the volume of the cylinder and the volume of a cone? What do the formulas have in common?

Which choice represents the sample space ,s for this event

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The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3