Mathematics, 03.06.2021 23:00 nyahdrake

Consider the following right pyramid and right prism. Both figures have a base that is a regular pentagon. 2
2
1
Heidi 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. The figures
have the same height. So the volumes must be the same."
What is the first mistake Heidi made?

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