Question

a circular cylinder just encloses a sphere of radius r. find
1. surface area of the sphere
2. curved surface area of the cylinder
3. ratio of the areas obtained in 1 and 2​

Answer 1

Answer:

नठलठलडलदॅडनडलढॅदढधॅझधोजदोजदोरजैछैथ

Answer 2

Answer:

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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