Question

In a sphere , Radius = 7 cm
FIND (A) T.S.A =
In case of hemisphere , radius = 3.5
FIND (A) C.S.A =
(B) T.S.A =
(FIND VALUE IN TERMS OF Π) (NOT PUT VALUE OF Π) ​ plz step by step​

Answer 1

Step-by-step explanation:

1. T.S.A of sphere = 4πr square

= 4 * π * 49

= 196π.

2. T.S.A of hemisphere = 3πr square

= 3*π*12.25

= 36.75π.

3. C.S.A of hemisphere = 2πr square

=2 * π * 12.25

= 24.5π.

Answer 2

Solution 1 :-

Given :-

• In a sphere , Radius = 7 cm.

To Find :-

• TSA of Sphere = ?

Answer :-

• TSA of Sphere = 196 π

Explaination :-

→ TSA of Sphere = 4πr²

→ TSA of Sphere = 4π(7)²

→ TSA of Sphere = 4π(49)

→ TSA of Sphere = 196 π

Therefore,TSA of Sphere is 196 π.

Solution 2 :-

Given :-

• In case of hemisphere , radius = 3.5

To Find :-

• CSA of hemisphere = ?
• TSA of hemisphere = ?

Answer :-

• CSA of hemisphere = 24.5π
• TSA of hemisphere = 36.75π

Explaination :-

→ CSA of hemisphere = 2πr²

→ CSA of hemisphere = 2π(3.5)²

→ CSA of hemisphere = 2π(12.25)

→ CSA of hemisphere = 24.5π

→ TSA of hemisphere = 3πr→²

→ TSA of hemisphere = 3π(3.5)²

→ TSA of hemisphere = 3π(12.25)

→ TSA of hemisphere = 36.75 π

Hence,

• CSA of hemisphere = 24.5π
• TSA of hemisphere = 36.75 π