Question

The length of the minute hand of a wall clock is $14cm.$ The area swept by the minute hand in $7.5$ minutes is

• A. $63c{m}^2$
• B. $77c{m}^2$
• C. $57.75c{m}^2$
• D. $15.4c{m}^2$

Answer 1

The correct option is B $77c{m}^2$

Required area$\frac{7.5}{60}\times \frac{22}{7}\times 14cm\times 14cm=77c{m}^2.$