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The diameter of the bottom surface of a cylinder is 14 cm, the surface area is 1406.72 square cm, and the height of the cylinder is______ Cm
The side area of the cylinder: 1406.72-3.14 × (14 ÷ 2) 2 × 2 = 1406.72-3.14 × 49 × 2 = 1406.72-307.72 = 1099 (square centimeter); the height of the cylinder: 1099 ／ (3.14 × 14) = 1099 ／ 43.96 = 25 (centimeter); answer: the height of the cylinder is 25 centimeter; so the answer is: 25
When a cylinder with a diameter of 5cm at the bottom and a height of 12cm is cut into two parts along the diameter, how many square centimeters does its surface area increase?
I'll take the arithmetic with me
Its surface area increased by 2 rectangles = 2 * bottom diameter * height = 2 * 5 * 12 = 120 square centimeters
How many square centimeters has the surface area increased by cutting a cylinder with a diameter of 5cm and a height of 12cm into two parts along a straight line?
A cylinder with a bottom diameter of 5cm and a height of 12cm is cut into two parts along a straight line. The surface area increases the area of two cross sections. The cross section is a rectangle with a length of 12cm and a width of 5cm
Surface area increased by 2 × (12 × 5) = 120 (cm ^ 2)
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