The radius of a solid hemisphere is 2r.Find its surface area.
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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
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
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