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The length of a rectangle is 5cm and the width is 12cm. Taking one of the edges as the axis, the rectangle is rotated for one circle, and the volume of the three-dimensional figure is ()
With a height of 5 cm and a radius of 12 cm, the resulting volume is 720 π = 2260.8 cubic cm
The side of a cylinder is 6.28cm long and 5cm wide
Because the circumference of the bottom surface of a cylinder is the length of a rectangle and the width is the height of the cylinder. Then divide the circumference of the bottom surface by π and divide by 2 to calculate the radius. V = sh
It is as follows
6.28÷3.14÷2
=2÷2
=1 cm radius is 1 cm
3.14 * 1 * 1 * 5 = 15.7 cm3
A: the volume of this cylinder is 15.7 cubic centimeters
As shown in the figure, a cylinder can be obtained by rotating edge AB for one circle, and then what is the volume of the cylinder (edge of cdab = 5cm, ad = 2cm, the figure is a rectangle)
π*4*5=20π
How much is the volume of this cylinder when you rotate a 4 cm long, 2 cm wide rectangular paper around the long side (2 cm) axis
V=3.14*2^2*4=50.24cm^3
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