Question

the radius and height of a cylinder are in the 5 ratio 7 and its volume is 550 cm cube find its radius

Answer 1

vol of cylinder = πr²h
let r= x
height = 7/5x
550 = 3.14× 7/5 x³
x= 5
Radius = 5 cm
height = 7cm

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Answer 2

v=pi×r×r×h
550 = 3.14×5x×5x×7x
x = 550/3.14×25×7
x = 1

r = 5x
= 5×1
=5 cm