Question

A solid sphere has a diameter of 25cm. Calculate its surface area.

Answer 1

Answer:

A=4πr2

d=2r

Solving forA

A=πd2=π·252≈1963.49541cm²

Answer 2

Diameter = 25cm

$radius = \frac{25}{2} cm$

radius = 12.5 cm

Surface area of a sphere = 4πr²

$= > 4 \times \frac{22}{7} \times \frac{25}{2} \times \frac{25}{2} cm {}^{2}$

$= > \frac{22 \times 25 \times 25}{7}$

$= > \frac{13,750}{7}$

$= > 1,964.28 \: cm {}^{2}$