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The volume of a cone is 12.56 cubic DM, the perimeter of its bottom surface is 6.28 DM, and the height of the cone is 1?
Lin Yan is me,
^2 is the square
The bottom area is:
3.14 × (6.28 ﹣ 3.14 ﹣ 2) ^ 2 = 3.14 (square decimeter)
The cone height is:
12.56 ﹣ 1 / 3 ﹣ 3.14 = 12 (decimeter)
The circumference of the bottom surface of a cone is 12.56 cm, the height is 6 cm, and its volume is______ Cubic centimeter, its bottom area is______ Square centimeter
12.56 △ 3.14 △ 2 = 4 △ 2 = 2 (CM) 3.14 × 22 = 3.14 × 4 = 12.56 (square cm) 13 × 12.56 × 6 = 12.56 × 2 = 25.12 (cubic cm) a: its volume is 25.12 cubic cm and its bottom area is 12.56 square cm
A cone tool used by construction workers is made of steel. Its bottom circumference is 12.56 cm and its height is 6 cm. If the steel weighs 7.8 g per cubic centimeter, how many kg does the tool weigh?
The volume of sand pile: 13 × 3.14 × (12.56 ﹣ 3.14 ﹣ 2) 2 × 6, = 13 × 3.14 × 22 × 6, = 3.14 × 4 × 2, = 25.12 (cubic centimeter), the weight of the tool: 25.12 × 7.8 = 195.936 (g); a: the weight of the tool is 195.936 kg
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