Question

The minute hand of a clock is 15 cm long. Calculate the area swept by it in 20 minutes. [ Take $\pi$ = 3.14.]

Answer 1

in 1 hr the clock will complete 1rotation here
radius of circle - 15cm
circumference of circle - 2πr
2×22/7×15 cm
30 × 22/7
- 94.2cm
in 20 min
=94.2*20/60
=31.4