the radius and height of a cylinder are in the radio 5:7 and its curved surface area is 5500sq.cm.Find its radius and height.
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Answer:
220cm2
Step-by-step explanation:
Let height and radius be (x)
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= 7x and 5x respectively
⇒πr2h = 550
π (5x) 2 × 7x = 550
227 × 25 x 2 × 7x = 550
x3 =1
x=1
∴Height=7cm
Radius=5cm
⇒ Curved surface area =2πrh
=2×227×5×7 = 220cm2
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