Question

The length of the minute hand of a clock is
21 cm. The area swept by the minute hand
in 20 minutes is
1) 462 cm2
2) 362 cm2
4) None
3) 562 cm2​

Answer 1

Answer :

1) 462 cm²

Given :

• The length of the minute hand of a clock is 21 cm.

To find :

• The area swept by the minute hand in 20 minutes

Solution :

area swept by min hand in 60 min = πr²

area swept by in it 20 min

= (πr²/60 x 20) cm²

= (22/7 x 21 x 21 x ⅓) cm²

= 462 cm²

=> Option 1 is correct option