Question

9. Find the area of a circular ring with external radius 50cm and internal
radius 49cm.​

Answer 1

Answer:

22/7*(50²-49²)

22/7*(50+49) (50-49)

22/7(99)

3.14*99

solve in calcy

Answer 2

Given:

• Circular ring with external radius 50cm and internal radius 49cm.
• where, R = 50 cm and R = 49 cm

To Find:

• Find the area of a circular ring

Solution:

$\sf area \: of \: a \: circular \: ring = \pi \: {R}^{2} - \pi {r}^{2} \\ = \pi( {R}^{2} - {r}^{2} ) \\ = \pi \: ( {50}^{2} - {49}^{2} ) \\ \sf = \pi(1)(99) \\ = 99\pi \: {cm}^{2}$

$\boxed{ \blue {\sf area \: of \: a \: circular \: ring = 99\pi {cm}^{2} }}$

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