The side area of a cylinder is 12.56 square centimeter, the radius of its bottom is 2 centimeter, and the height of it is______ Cm

The side area of a cylinder is 12.56 square centimeter, the radius of its bottom is 2 centimeter, and the height of it is______ Cm

12.56 ÷ (2 × 3.14 × 2) = 12.56 ÷ 12.56 = 1 (CM); answer: its height is 1 cm

The circumference of the bottom surface of a cylinder is equal to 2 / 3 of the circumference of the bottom surface of a cone. The height of the cylinder is 25% of the height of the cone. If the volume of the cylinder is 12 cubic decimeters, calculate the volume of the cone ()

The circumference of the base of a cylinder and a cone is proportional to the radius, while the area of the base is proportional to the square of the radius
When one side is fixed, the volume of the cone is directly proportional to the area or height of the bottom, so v = 12 × 3 / 2 × 3 / 2 × 1 / 3 × 4 = 36

The volume of the first cylinder is 120 cubic decimeters. What is the volume of the second cylinder

120÷2×3＝180