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Length 60cm, width 15cm, weight 108G. What is the diameter?
Who can answer me 100 points
The diameter and height of the bottom surface of a cylinder are 10 cm, and its side area is (), and its surface area is ()
1 314
2 471
After a section of cylinder wood with a diameter of 10 cm is uncovered longitudinally along the diameter of the bottom surface, the surface area increases by 200 square cm. What is the original volume of this section?
The height of the cylinder is: 200 ／ 2 ／ 10, = 100 ／ 10, = 10 (CM); so the volume of the cylinder is: 3.14 × (10 ／ 2) 2 × 10, = 3.14 × 25 × 10, = 785 (cm3); a: the original volume of the cylinder is 785 cm3
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