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### First Question:
# Brief Explanations:
The principle about solids with equal cross - sectional areas at every height having equal volumes is known as Cavalieri’s Principle.
# Answer:
Cavalieri’s

### Second Question:
# Brief Explanations:
The formula $ V=\pi r^{2}h $ is used to calculate the volume of a cylinder, where $ r $ is the radius of the base and $ h $ is the height.
# Answer:
volume

### Third Question:
# Brief Explanations:
The cross - sectional area of a solid is the area of a two - dimensional slice (a plane - cut section) at a given height.
# Answer:
slice

### Fourth Question:
# Brief Explanations:
The formula for the volume of a prism is $ V = B\times h $, where $ B $ is the base area and $ h $ is the height of the prism. So we multiply the base area by the height.
# Answer:
height

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