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12-25.

Find the volume of each shape below. Assume that all corners in part (b) are right angles.

1. cone

What is the formula for the volume of a cone?

$V= \frac{ 1 }{3 }(\pi)(3^2)(10) = 30 \pi = 94.2 \text{ un}^3$

1. Find the volume of an $18$ by $21$ by $10$ rectangular prism, then subtract the missing parts.

$2340$ un$^3$