Question

find the volume of a sphere whose surface area in 154cm²​

Answer 1

Surface area of sphere=4πr²=154cm²

4πr²=154=4(22/7)r²=154r²=154

$154 \times 7 \div 4 \times 22$

=

$7 {^{2} \div 2 {}^{2}$

r=7/2=3.5cm.

Hence, Volume =4/3πr³

$4 \div 3\pi \times 3.5 \times 3.5 \times 3.5 = 179cm3$

Answer 2

Surface area of sphere=4πr²=154cm²

4πr²=154=4(22/7)r²=154r²=154

154 \times 7 \div 4 \times 22154×7÷4×22

=

7 {^{2} \div 2 {}^{2}

r=7/2=3.5cm.

Hence, Volume =4/3πr³

4 \div 3\pi \times 3.5 \times 3.5 \times 3.5 = 179cm34÷3π×3.5×3.5×3.5=179cm3