Question

If the diameter of a sphere is 14 cm, then what is the surface area (in cm2) of the sphere?

Answer 1

given diameter of the sphere = 14cm

therefore it's radius = 14/2 = 7cm (since diameter is double the Length of it's radius)

formula to find the surface area if a sphere is 4πr².

hence, it's surface area = 4πr²

= 4 × 22/7 × 7 × 7

= 88 × 7

= 616cm²

Answer 2

$\large{\mathfrak{\underline{\underline{Solution:-}}}}$

______________________

Given diameter = 14 cm

∴ Radius = $\bf{\frac{14}{2} = 7}$

(Since, diameter is two times of it's radius)

★ $\large{\bf{\boxed{ Formula: 4πr^{2} }}}$

ATQ,

$\large{= 4 \times \frac{22}{7} \times 7 \times 7}$

$\large{= 4 \times 22 \times 7}$

$\large{= 4 \times 154}$

$\large{\boxed{\red{616 \: {cm}^{2} }}}$