Question

The area $\lambda$ enclosed by two concentric circles of radius 5 cm and 12 cm is ___ $c{m}^2$

• A. Both the statements are true
• B. Statement 1 is true and statement 2 is false
• C. Statement 1 is false and statement 2 is true
• D. Both the statements are false

Answer 1

The correct option is B

Statement 1 is true and statement 2 is false

Area of ring $=\pi (R^2-r^2)$

$=\frac{22}{7}({12}^5-5^2)$

$=\frac{22}{\text{/}7}\left(17\right)\left(\text{/}{7}^1\right)$

$=374c{m}^2$

Hence (B)