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Apply Cavalieri's principle

Problem

Consider the following cylinder and cone.
A cylinder with a base radius of four units and a height of ten units. A cone with a base radius of four units and a height of ten units.
Marcel tried to use Cavalieri's principle to show that the two figures have the same volume.
"The base areas are the same. Therefore, corresponding cross-sections have the same area. So the volumes must be the same."
What is the first mistake Marcel made?
Choose 1 answer:
Stuck?
Stuck?