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The circumference of the bottom surface of a cylinder is 15.7 cm, and the side area is 62.8 square cm
Gao Shi
62.8 △ 15.7 = 4cm
What is the radius of the bottom
15.7 ﹣ 3.14 ﹣ 2 = 2.5cm
The volume is
2.5 × 2.5 × 3.14 × 4 = 78.5 cm3
How to find the volume of a cylinder by knowing the base area and perimeter
Can't ask, want to know height, or side area
Cylinder volume = square of radius x3.14xh = square of R x3.14xh
=The square of the quotient of (diameter △ 2) is x3.14xh = (D △ 2) 2x3.14xh
=(perimeter of bottom surface △ 3.14 △ 2) square of quotient x3.14xhigh = (C △ 3.14 △ 2) 2x3.14xh
Too much, think for yourself
The volume of a cylinder is 23.55 cubic meters, the side area is 31.4 square meters, and the circumference of its bottom
Let the bottom radius be X,
23.55÷（X*X*3.14）=31.4÷（2X*3.14）
7.5/X²=5/X
X=1.5
Bottom perimeter = 2 * 1.5 * 3.14 = 9.42m
The circumference of the bottom surface of a cylinder is 6.28 decimeters. If the height is increased by 2 cm and the side area is 43.96 square decimeters, the volume of the original cylinder can be calculated
2 cm = 0.2 decimeter
Bottom radius = 6.28 △ 3.14 △ 2 = 1 (decimeter)
Bottom area = 3.14 × 1 & # 178; = 3.14 (square decimeter)
Current height = 43.96 △ 6.28 = 7 (decimeter)
Original height = 7-0.2 = 6.8 (decimeter)
Original volume = 3.14 × 6.8 = 21.352 (cubic decimeter)
The diameter of the bottom surface of a cylinder is two decimeters. When the height of the cylinder is increased by two decimeters, the side area is 43.96 square decimeters. How many cubic decimeters is the original volume of the cylinder
What is the radius of the bottom
2 △ 2 = 1 (decimeter)
What is the perimeter of the bottom surface
2 × 3.14 = 6.28 (decimeter)
Now the column is high
43.96 △ 6.28 = 7 (decimeter)
The original cylinder height
7-2 = 5 (decimeter)
The original volume of the cylinder is
1 × 1 × 3.14 × 5 = 15.7 (cubic decimeter)
The circumference of the bottom surface of a cylinder is equal to the height. If the height is shortened by 2 cm, the surface area will be reduced by 12.56 square cm
Only the side area is reduced
Bottom circumference = 12.56 △ 2 = 6.28 (CM)
Bottom radius = 6.28 △ 3.14 △ 2 = 1 (CM)
Bottom area = 3.14 × 1 & # 178; = 3.14 (cm2)
Original cylinder volume = 3.14 × 6.28 = 19.7192 (cm3)
If the circumference and height of the bottom of a cylinder increase to twice of the original, and the volume of the cylinder increases to 35m, what is the volume of the original cylinder?
The original volume is 5M and 179;
Because the perimeter of the ground is doubled, that is, the radius is doubled
Let the height be h, the original volume V1 = π R & # 178; h, and the later volume V2 = 2H * π (2R) &# 178; = 8 π R & # 178; H
V2-V1=7πr²h=35
So π R & # 178; H = 5
The height of a cylinder is 5 cm. If the height is increased by 3 cm, the surface area will be increased by 94.2 square cm. The volume of the cylinder is () (as long as the number is obtained!)
The height of a cylinder is 5cm. If the height is increased by 3cm, the surface area will be increased by 94.2cm2. The volume of the cylinder is (392.5cm3)
If the height of a 5 cm cylinder increases by 3 cm, its surface area will increase by 18.84 square cm. What is the volume of the original cylinder?
The circumference of the bottom surface of the original cylinder is: 18.84 △ 3 = 6.28 (CM), the radius of the bottom surface of the original cylinder is: 6.28 △ 3.14 △ 2 = 1 (CM), the volume of the original cylinder is: 3.14 × 12 × 5 = 15.7 (cm3), a: the volume of the original cylinder is 15.7 cm3
There are two squares, one big and the other small, whose perimeter differs by 20 cm and area by 55 square cm. What is the area of a small square?
55-5 × 5 = 30 (square centimeter); 30 ／ 2 ／ 5 = 3 (centimeter); 3 × 3 = 9 (square centimeter). Answer: the area of a small square is 9 square centimeter
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