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How to write the fourth multiple-choice question of Hubei science mathematics in the college entrance examination?
20 12?

Geometry is a cylinder. Cut off 1/4, leaving the remaining volume.

Bottom area s = π r 2 = π

Cylinder volume V=S*h=4π.

Geometric volume =4π- 1/4*4π=3π.

Choose b and you will know what you copied ~

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