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If the height of a cylinder is reduced by 2 cm, its surface area will be reduced by 50.24 square cm. The diameter of the bottom surface of the cylinder is ()?
Bottom perimeter = 50.24/2 = 25.12
Bottom diameter = 25.12 / (3.14) = 8
A section of square steel is 22 cm high and the bottom is a square with a circumference of 24 cm. What is the volume of this section of steel?
Square side length = 24 △ 4 = 6cm
Area = 6 × 6 = 36 square centimeter
The volume is 22 × 36 = 792 cubic centimeters
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How long can a cylindrical steel with a circumference of 25.12 cm at the bottom and a height of 125 cm be cast into a rectangular steel with a cross section of 5 cm at the side?
Bottom radius: 25.12 △ 3.14 △ 2 = 4 (CM), 3.14 × 42 × 125 = 5 × 5 × h, 3.14 × 16 × 125 = 25h, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; H = 3.14 × 16 × 5, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp
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