Question

find the area swept by hour band in three hours if the length of the hour hand is 21 cm​

Answer 1

Step-by-step explanation:

Area for 1 hour = π r²

here , r = 21 cm

and π = 22÷7

Now , by solving

= (22÷7) × 21 × 21

= 22 × 3× 21

=1386 cm.sq.

Number of hours = 3

therefore, multiplying 1 hour area with 3, we get,

4158 cm.square

which is required answer