Question

find the area of circular ring whose inner and outer diameter are 20 cm and 22 cm respectively

Answer 1

hello frnd!!

here's ur answer...

diameter of inner circle=20cm

therefore radius=20/2=10cm

diameter of outer circle=22cm

therefore radius=22/2=11cm

area of inner circle=πr²

=22/7×10×10

=2200/7cm²

area of outer circle=πr²

=22/7×11×11

=2662/7cm²

hence, area of the ring=2662-2200/7

=462/7

=66cm²

hope this helps...

(^^)

Answer 2

$The \ area \ of \ circular \ ring \ is \ 66 \ \mathrm{cm}^{2}$

Given:

Inner diameter of circular ring (d) = 20 cm

Inner radius of circular ring (r) = 10 cm

Outer diameter of circular ring (D) = 22 cm

Outer radius of circular ring (R) = 11 cm

To find:

The area of circular ring.

Solution:

The formula for finding the area of circular ring whose inner and outer diameter is given below:

$Area \ of \ circular \ ring = \pi\left(R^{2}-r^{2}\right)$

$=\frac{22\left(11^{2}-10^{2}\right)}{7}$

$=\frac{22 \times 21}{7}$

$=\frac{462}{7}$

$The \ area \ of \ circular \ ring \ is \ 66 \ \mathrm{cm}^{2}$