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The length of a rectangle is 5cm and the width is 4cm. After rotating around the short side, you will get a cylinder whose volume is () Chasing 50 points
Square of 5 * 3.14, then * 4 (5 is the bottom radius, 4 is the height)
5*5*3.14*4
=25*3.14*4
=78.5*4
=314
The circumference of the bottom surface is 25.12cm, and the height is 5cm
Radius of spherical cylinder
2πr=25.12cm
So r = 25.12 △ 3.14 △ 2 = 4cm
The volume π R & sup2; H = 3.14 × 4 & sup2; × 5 = 251.2 CM & sup3;
Rotate a 4 cm, 3 cm rectangular paper around an edge to get a cylinder. What is the volume of the cylinder?
There are two ways
Take a 4 cm long and 3 cm wide rectangular paper and rotate it around one side to get a cylinder. This is the result
This cylinder could be
3÷2＝1.5（CM）1.5×1.5×3.14×4＝25.12（CM³）
4÷2＝2（CM）2×2×3.14×3＝37.68(CM³）
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