How much wood should be cut when a cylinder with a circumference of 12.56 and a height of 6dm is cut into the largest cone?

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• 1. How much wood does it take to cut a cylinder with a circumference of 12.56dm and a height of 6dm into the largest cone
• 2. If a cylinder and a cone are of equal height and equal base, the sum of their volumes is 80 cubic centimeters, then the volume of the cylinder is 80 cubic centimeters
• 3. If the h of the cylinder is shortened by 2cm, the surface area will be reduced by 12.56cm? h: High. V: volume
• 4. There is a rectangle with a length of 5cm and a width of 4cm, which rotates around the straight line of its length and width respectively to get different cylinders, What are their volumes? Whose is the largest? What kind of enlightenment do you get?
• 5. Now, a rectangle with a length of 4cm and a width of 3cm is rotated around the straight line of its length and width respectively to get different cylinders. How big are their volumes?
• 6. A rectangle is 5cm long and 2cm wide. Take its long side as the axis, rotate it for a circle, and the figure is (), its ground diameter is () cm, and its height is () cm
• 7. A rectangle is 4cm long and 2cm wide. Take its long side as the axis, turn the rectangle for a circle, and get a cylinder with a volume of () A. 8πcm3B. 4πcm3C. 16πcm3D. 12πcm3
• 8. A cylinder, the sum of its two bottom areas is equal to the side area, known its surface area is 56 square decimeters, find its volume I forgot all about the kids
• 9. A cylinder, the sum of its two bottom areas is equal to the side area. Always its surface area is 56 square decimeters, find the volume
• 10. The side area of a cylinder is 94.2 square centimeters, and the volume is 141.3 cubic centimeters. What is the surface area of the cylinder?
• 11. The diameter of the bottom surface of a cylindrical part is 8 cm. There is a cylindrical straight hole at one end of the part. The diameter of the round hole is 6 cm and the depth of the hole is 7 cm. If the part of the part that is in contact with air is coated with antirust paint, how many square centimeters should it be coated? It's not 12 meters. It's 12 centimeters
• 12. The four numbers ABCD are arranged in two rows and two columns with a vertical line on each side. The definition is = ad BC, if x + 1 x - 1 1 x X X The four numbers ABCD are arranged in two rows and two columns, with a vertical line on each side. The definition is = ad BC, if x + 1 x - 1 1 - x x x + 1 What is x equal to
• 13. The four numbers a, B, C and D are arranged in two rows and two columns, and a vertical line is added on both sides to mark them as | a B |, which is defined as | a B | = AD + BC, | C D | C D| The four numbers a, B, C and D are arranged in two rows and two columns, and a vertical line is added on each side to mark them as | a B |. Define | a B | = AD + BC, | C D | C D |. The above marks are called second-order determinants. If | x + 1 X-1 | X-1 x + 1 | = 6, then x + 1 | = 6=
• 14. If ABCD = ad BC is defined, try to find the value of three quarters, 1.5, one and three thirds, 6
• 15. Let three mutually unequal rational numbers be expressed in the form of 1, a + B, a respectively, and in the form of 0, a / B, B respectively Find 2010 power of a + 2009 power of B
• 16. Given that a is a rational number and (a - √ 3) square = 7 + 4 √ 3, find the value of A fast
• 17. Let a and B be rational numbers, | A-3 | + | B + 7 | = 0. Find the value of (a + b) [- A - (- b)]
• 18. For rational numbers a, B, define the operation: a △ B = (3a + b) / (a-3b), find the value of 7 △ 6 Every step of the analysis! Quick, OK, I'll give it to him!
• 19. If the equation AX = BC holds, then the following equation holds: a.abx = ABC b.x = BC c.b-ax = a-bc D.B + AX = B + BC
• 20. It is known that the parabola y = ax of bungalow + BX + C (a > o) and the straight line y = K (x-1) - K bungalow / 4, no matter K is any real number, the parabola and the straight line have only one common number