Question

A piece of cloth is required to completely cover a solid object. The solid object is composed of a hemisphere and a cone surmounted on it. If the common radius is 7 m and height of the cone is 1 m, what is the area of cloth required?

A) 262.39m2
B) 463.39m2
C) 662.39m2
D) 563m2
pls help me! :(​

Answer 1

• ▶(B) 463.39 m²

Explanation:

`\space`

Surface area of hemisphere = 2πr²

=> 2×22/7× (7)² = 308 m²

☯For calculating the surface area of a cone we need to calculate its slant height,

`\sf{ \leadsto \: 1 = √(49 + 1) = √(50 \: ) m}`

`\space`

`\sf{ \leadsto \: \pi \ r1 = (22)/(7) * 7 * √(50) = 463.39 \: {m}^(2) }`

`\: \:`

Hope it helps!

Have a great day! :)