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Take a cylinder 8 cm high and cut it into two and a half cylinders along its diameter. The surface area is increased by 96 square centimeters. Calculate the surface area of the original cylinder Although the score is low, everyone answers
96 / 2 = 48CM the area of a cuboid
48 / 8 = 6cm diameter
6 / 2 = 3cm radius
3 * 3 * 3.14 * 2 + 2 * 3.14 * 3 * 8 = 207.24 (cm2) surface area
The height of a cylinder is 8 cm and its side area is 251.2 square cm. What is its volume?
Bottom circumference: 251.2 △ 8 = 31.4 (CM), bottom radius: 31.4 △ 3.14 △ 2 = 5 (CM), volume: 3.14 × 52 × 8, = 3.14 × 25 × 8, = 78.5 × 8, = 628 (CC); answer: its volume is 628 CC
If the side area of a cylinder is 50.24 square centimeter and the height is equal to the bottom radius, what is the surface area?
Let the radius of the bottom of the cylinder be r cm, then the height is r cm. According to the formula of the side area of the cylinder, we can get: 3.14 × 2 × R × r = 50.24, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 6.28r2 = 50.24, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp
RELATED INFORMATIONS
- 1. If the side area of a cylinder is 50.24 square centimeter and the height is equal to the bottom radius, what is the surface area?
- 2. If the height of a cylinder is reduced by 2 cm, its surface area will be reduced by 50.24 square cm. The diameter of the bottom surface of the cylinder is ()?
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