The volume of a cone is 36 DM3, its bottom area is 18 DM2, and its height is (c) DM. A, 23 B, 2 C, 6 D, 18 D How many should I choose? Let's talk about Chen. How can I calculate

The volume of a cone is 36 DM3, its bottom area is 18 DM2, and its height is (c) DM. A, 23 B, 2 C, 6 D, 18 D How many should I choose? Let's talk about Chen. How can I calculate

Because the bottom area of the cone is divided by 3, 36 × 3 = 108dm2108 △ 18 = 6dm, so the answer is C

The bottom area of a cone is 12 DM and 178; the volume of a cone is 9 DM and 179;

Volume = 1 / 3 × 12 × 9 = 36 cubic decimeter
If you understand and solve your problem,

The height of a cylinder is 4cm, and its volume is 36dm, which is 12dm more than that of a cone with the same base. What is the height of this cone?
Please make it easy for me to understand,

Volume of cylinder v = s (area of bottom circle) * H (height of cylinder), s = V / h = 36 / 0.4 = 90dm ^ 2,
The volume of cone is v = 1 / 3 * s * h, H = 3V / S = 36 / 90 = 0.4dm

The side length of a square with an area of 1 square kilometer is () meters, and the side length of a square with an area of 1 hectare is () meters

The side length of a square with an area of 1 square kilometer is (1000) meters, and the side length of a square with an area of 1 hectare is (100) meters

A square with a side length of () meters covers an area of 1 hectare, and a square with a side length of () is 1 square kilometer

1 hectare = 10000 square meters = 100 meters * 100 meters. 1 square kilometer = 1000000 square meters = 1000 meters * 1000 meters. The area of a square with a side length of (100) meters is 1 hectare, and the area of a square with a side length of (1000) meters is 1 square kilometer

The perimeter of a square rice field is 2000 meters. How many hectares is this rice field

25

What's the length of the side? The square area is 1 hectare

1 ha = 10000 M2
Because: 100 × 100 = 10000 square meters = 1 hectare
So: a 100 meter square with an area of 1 hectare

There are three plots. The second plot is 80% of the first plot. The third plot is 20% more than the second plot. The total area of the three plots is 69 hectares
How many hectares of each of the three plots
It's better not to use equations

（1+20%）×80%=96%
The first plot: 69 (80% + 96% + 1) = 25 hectares
Second block: 25 × 80% = 20 ha
Third block: 25 × 96% = 24 ha

There are three pieces of land. The first piece is 6 hectares. The first piece is 1 / 5 less than the second piece. The third piece is 20% more than the second piece. How many hectares are there in the second piece and how many hectares are there in the third piece

The second block: 6 / (1-1 / 5) = 6 / (4 / 5) = 6 * 5 / 4 = 7.5 hectares
The third block: 7.5 * (1 +. 2) = 1.2 * 7.5 = 1.2 * 5 * 1.5 = 6 * 1.5 = 9 hectares

There are three grasslands with an area of 4 mu, 8 mu and 10 mu respectively. The grass on the grassland is as thick and grows as fast. The first grassland can feed 24 cows for 6 weeks, and the second grassland can feed 36 cows for 12 weeks. How many weeks can the third grassland feed 50 cows?

Let each cow eat one portion of grass per week. We change the topic. There is a piece of grassland with an area of 1 mu, which can be fed by 24 ／ 4 = 6 cows for 6 weeks, 36 ／ 8 = 92 cows for 12 weeks. How many weeks can be fed by 50 ／ 10 = 5 cows? Therefore, the length of grass per week is (92 × 12-6 × 6) / (12-6) = 3