1. Cut a cylinder along the radius of the bottom, divide it equally, and then put it together into an approximate cuboid. The cuboid is 12.56 cm long and 10 cm high. The volume of the cylinder is () cubic cm 2. The height of the cylinder is three times that of the cone. The ratio of the bottom radius of the cylinder to the bottom radius of the cone is 1:2. The volume ratio of the cylinder to the cone is () 3. The diameter of the bottom of a cone is 8 cm and the height is 12 cm

1. Cut a cylinder along the radius of the bottom, divide it equally, and then put it together into an approximate cuboid. The cuboid is 12.56 cm long and 10 cm high. The volume of the cylinder is () cubic cm 2. The height of the cylinder is three times that of the cone. The ratio of the bottom radius of the cylinder to the bottom radius of the cone is 1:2. The volume ratio of the cylinder to the cone is () 3. The diameter of the bottom of a cone is 8 cm and the height is 12 cm

1.4*3.14*10=125.6
2.9:4
three point nine six

(1) A pool covers an area of 8.25 square meters. The water depth of the pool is 1.2 meters. How many cubic meters of water is in the pool?
(2) Overtime delivery truck is a cuboid. The length, width and height measured from inside are 3 meters, 1.5 meters and 1.2 meters. If the weight of goods per cubic meter is 1.4 tons, how many tons can be transported at one time? If there are 24 tons of such goods, how many times can a truck transport them?
(3) A cube container with a length of 20cm. Fill it with water and pour it into a large cube container with a bottom side length of 40cm. Find the depth of water in the large cube
(4) A 2m long iron wire can be used as a 6 cm long, 5 cm wide and 3 CN high rectangular frame
(5) A fuel tank. It is 40 cm long, 30 cm wide and 20 cm high. How many square decimeters of iron sheet is needed to make such a fuel tank? The weight of each liter of oil is 0.75 kg. How many kg of oil is it loaded?
Please make a formula. The better the answer, the higher the score!

1. 8.25 × 1.2 = 9.9 (M3)
2. (1), 3 × 1.5 × 1.2 × 1.4 = 7.56 (tons) (2), 24 △ 7.56 ≈ 4 (Times)
3、（20×20×20）÷（40×40）=5（cm）
4. 2 △ [(0.06 + 0.05 + 0.03) × 4] ≈ 3 (pieces)
5. (1), (4 × 3 + 4 × 2 + 3 × 2) × 2 = 52 (square decimeter)
(2) 75 = 18 (kg)

Math problems in Grade 6 of primary school
Cut a circle into several equal parts along its diameter, and then form an approximate rectangle. In this way, the circumference of the rectangle is 8 cm more than that of the circle, and the circumference of the circle is () cm

An extra 8 cm is a diameter
So the perimeter is 8 π≈ 8x3.14 = 25.12cm
How difficult the primary school problem is

Huff's pyramid is the largest. According to experts' estimation, if the stones of this pyramid are chiseled into basketball sized stones and arranged in turn along the equator, the total length is equivalent to three-thirds of the circumference of the equator. It is required to calculate the total length of the small stones after arrangement

Equatorial circumference = 40 075.24 km
The total length of small stones after arrangement = 40 075.24 * three thirds = 26716.82 km