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1]Diameter and height of a cylinder are 42cm and 10cm.Find it's volume2]the volume of a cylinder is 3960cm[cube].Its curved surface area is 1320cm[square].Find the radius of base and height of cylinder.PLz its urgent |
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Answer» 1. Given, DIAMETER and HEIGHT of a cylinder are 42cm and 10cm. then r = 42/2 = 21 Then it's volume = πr²h = 22/7 × 21× 21× 10 = 13,860 cm³ 2. volume of cylinder = πr²h = 3960 πr²h = 3960 => r²h = 3960 × 7/22 r²h = 1260 ---------- 1 csa of cylinder = 2πrh = 1320 2πrh = 1320 => rh = 1320 × 7/22×2 rh = 210 h = 210/r ---------------------2 by substituting in 1 we get r² × 210/r = 1260 r = 1260/210 r = 6 cm then by substituting it in 2 we get h = 210/6 h = 35 cm therefore radius(r) = 6 cm and height(h) = 35 cm |
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