Question

the radius of the solid hemisphere is 2r find its total surface area

Answer 1

Radius of a hemisphere = 2r ( Given )

Total Surface Area of a hemisphere = A

=> A = 3π ( radius )²

= 3 × ( 22/7 ) × ( 2r )²

= 3 × ( 22/7 ) × 4r²

= ( 264/7 )r² square units .

Or

A = 3π( 2r )²

=> A = 3π × 4r²

=> A = 12πr² square units

••••

Answer 2

Answer:

12πr² square units

Step-by-step explanation:

Radius= 2r

TSA of hemisphere= 3πr²

= 3π(2r)² = 3π×4r²

= 12πr² square units

Hope It Helps :)