Two stacks of 23 quarters each are shown. One stack forms a cylinder but the other stack does not form a cylinder. Why are the volumes of these two stacks of quarters equal? Use Cavalieri's Principle to explain your thinking. A If Stack 1 was twisted it would look like Stack 2, so the stacks must have the same volume. B If Stack 2 was straightened it would look like Stack 1, so the stacks must have the same volume. C Every cross section parallel to the bases has an equal area. Because the stacks are the same height, the stacks must have the same volume. D Every cross section perpendicular to the bases has an equal area. Because both stacks have height, the stacks must have the same volume.

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