A right circular cylinder just encloses a sphere of radius 6 cm. If A and B are their curved surface area, then:
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Step-by-step explanation:
Given:
Radius of sphere=r
Radius of cylinder= Radius of sphere=r
Height of cylinder= diameter= 2r
(i) The surface area of the sphere with radius r (A1)= 4πr²
(ii)
Curved surface of cylinder (A2)=2πrh
= 2π × r × 2r
= 4πr²
(iii) Required ratio of the areas = A1:A2
= 4πr²:4πr² = 1:1
Ratio of the areas obtained= 1:1
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