Question

A spherical tennis ball is of diameter 7.0 cm.
Find (a) its volume, and (b) its surface area.

Answer 1

Answer:

(a)205.33cm³ (b)616cm²

Explanation:

volume of sphere=4/3pir²

=4/3×22/7×7×7

=4/3×22×7

=4/3×154

=616/3

=205.33cm³

:. volume of the spherical ball =205.33

surface area of sphere=4×pi×r²

=4×22/7×7×7

=4×22×7

=88×7

=616cm².........

plz mark as brainliest if helpful...........

Answer 2

Given:

Diameter of spherical ball = 7 cm

So, Radius = 7 / 2 cm

To find:

• volume of the spherical ball
• surface area of the spherical ball

Answer:

a) Formula of volume of sphere

$= \frac{4}{3} \times \pi {r}^{3}$

$= \frac{4}{3} \times \frac{22}{7} \times \frac{7}{2} \times \frac{7}{2} \times \frac{7}{2}$

$= \frac{1}{3} \times \frac{11}{1} \times 1 \times \frac{7}{1} \times \frac{7}{1}$

$= \frac{539}{3}$

= 179.66 cm³

b) Formula of surface area of sphere

$= 4\pi \: r {}^{2}$

$= 4 \times \frac{22}{7} \times \frac{7}{2} \times \frac{7}{2}$

$= 22 \times 7$

= 154 cm²

P.S Mark as brainliest if it's helpful to you

=)