Question

the radius of a sphere is 3.5 find its surface area and volume

Answer 1

Radius = 3.5

$surface \: area \: = 4\pi {r}^{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:= 4 \times \frac{22}{7} \times 3.5 \times 3.5 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 154$
$volume = \frac{4}{3} \pi {r}^{3} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{4}{3} \times \frac{22}{7} \times 3.5 \times 3.5 \times 3.5 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 179.6$

Answer 2

surface area of sphere= 4pie r²
=4×22/7×3.5×3.5
=154
volume of sphere=4/3pie r³
=4/3×22/7×3.5×3.5×3.5
=179.66666667