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The diameter of a cylindrical pool is 20m, and the depth is 3M1. (1) what is the floor area of the pool? (2) how many cubic meters of soil need to be excavated to dig the pool?
Floor area: S = π (D / 2) ^ 2 = 3.14 * 10 ^ 2 = 314 square meters
The excavated earthwork is volume: v = bottom area times height = 314 * 3 = 942 cubic meters
Hope to adopt
The diameter of the bottom of a cylindrical pool is 20 meters and the depth is 2 meters. What is the floor area of the pool? How many cubic meters of soil need to be excavated to dig the pool?
In one exam, the average score of the whole class was 85.5. There were 25 girls in the class, and their average score was 86. There were 26 boys in the class. What was their average score? Master Wang processed a batch of parts, 60% of which were processed in the first three days, 150 in the fourth day, and 1 / 5 of the total number was not processed, How many parts are there in this batch?
Floor area of pool = 3.14x10 ^ 2 = 314m ^ 2
Excavation = 314x2 = 628m ^ 3
Plastering surface = 2x3.14x10x2 + 314 = 439.6m ^ 2
Average share of boys = (85.5x (25 + 26) - 86x25) / 26 = 85.02
The proportion of the whole batch of parts processed on the fourth day = 1-60% - 1 / 5 = 20%
Then sub batch parts = 150 / 20% = 750
Build a cylindrical pool with a bottom diameter of 20 meters and a depth of 2 meters. How many cubic meters of soil do you need to dig this pool?
I don't know what happened just now. My problem is gone. Please tell me again. I think the square of 2pair should be the area of a circle. But the title is cubic meter, which is volume. The volume of a circle doesn't seem to exist. So I have to work out 628,
What is the radius of the bottom
20 △ 2 = 10m
What's the bottom area
10 × 10 × 3.14 = 314 square meters
Digging this pool requires digging
314 × 2 = 628 M3
Dig a cylindrical pool with a bottom circumference of 6.28 meters and a depth of 2 meters. The pool covers an area of () square meters and excavated soil of () cubic meters
Dig a cylindrical pool with a perimeter of 6.28 meters and a depth of 2 meters. The pool covers an area of (3.14) square meters and excavates (6.28) cubic meters of soil
14. To build a cylindrical pool, the bottom radius is 4 meters and the depth is 1.8 meters. At least how many cubic meters of soil should we dig?
To cement the bottom and sides of it, what is the area of cement?
At least dig = 3.14x4x1.8 = 90.432
Area of plastering cement = 3.14x4x4 + 3.14x4x2x1.8 = 95.456
A cylindrical reservoir with a diameter of 10 meters and a depth of 2 meters on the bottom. How many square meters does the tank cover?
Cement the bottom and sides of the pool. The area of the cement part is - how many tons of water can be stored in the pool at most
A cylindrical reservoir with a bottom diameter of 10 meters and a depth of 2 meters, what is the floor area of the reservoir? Plaster cement on the bottom and side of the reservoir, and what is the area of the cement plastering part? How many tons of water can be stored in the reservoir? Solution: the radius of the bottom circle of the reservoir is: 10 / 2 = = 5 meters, and the floor area of the reservoir is: 3
A circular reservoir with a bottom diameter of 12m and a reservoir depth of 5m. What is the floor area of the reservoir? What is the maximum volume of the reservoir
Floor area = 3.14 × (12 △ 2) &# 178; = 113.04 square meters
Maximum volume = 113.04 × 5 = 565.2m3
A cylindrical reservoir with a bottom radius of 10 meters can store 2512 cubic meters of water. If the depth of excavation is 2 meters, how many cubic meters can it store?
2512 ÷ (3.14 × 102), = 2512 ／ 314, = 8 (m); 3.14 × 102 × (8 + 2), = 314 × 10, = 3140 (M3); answer: it can store 3140 m3
A cylindrical reservoir with a bottom radius of 10 cm can store water of 1570 square meters. If the depth of excavation is 2.5 meters, how many cubic meters can the reservoir store water?
Bottom radius is 10 cm reservoir? Is it dug by children playing games? Should it be 10 meters?
Current depth of cylindrical reservoir = 1570 / (3.14 * 10 * 10) = 5m
If the depth of excavation is 2.5 meters, the volume of the reservoir will be reduced
=3.14*10*10*(5+2.5)
=2355 M3
1. A cylindrical reservoir with a bottom radius of 10 meters can store 2512 cubic meters of water. If the depth of excavation is 2 meters, how many cubic meters can the reservoir store
2. There is a cone-shaped sand pile with a bottom area of 12.56 square meters and 2 meters. How many meters can we use this pile of sand to pave a 2 cm thick road on a 10 meter wide road?
Oh, 888888,
1. A cylindrical reservoir with a bottom radius of 10 meters can store 2512 cubic meters of water. If the depth of excavation is 2 meters, how many cubic meters can the reservoir store?
Bottom area: 3.14 × 10 × 10 = 314 (M2)
Water storage capacity: 2512 + 314 × 2 = 3140 (M3)
2. There is a cone-shaped sand pile with a bottom area of 12.56 square meters and a height of 1.2 meters. How many meters can we use this pile of sand to pave a 2 cm thick road surface on a 10 meter wide road?
2 cm = 0.02 M
12.56 × 1.2 × 1 / 3 (10 × 0.02) = 25.12 (m)
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