Question

TV ZOT cm
D 252 cm
The minute needle of a watch is 21 cm long. The area covered by it in
10 minutes is​

Answer 1

Answer:

231 cm sq

Step-by-step explanation:

For the clock (circle)

radius(r) = 21 cm

Angle made by the minute hand in 5 mins

= 360/12

= 30°

Angle made by the minute hand in 10 mins

= (30 x 2) °

= 60°

Area covered by minute hand in 10 mins

= (60/360 x π x r x r) cm sq

= (1/6 x 22/7 x 21 x 21) cm sq

= (1/2 x 22 x 7 x 3) cm sq

= (11 x 21) cm sq

= (11 x 21) cm sq

= 231 cm sq

The value of thetha can be calculated as because the clock can be divided upto 12 equal sectors. Total angle = 360 and thetha = 360/12

Also radius of clock = length of the minute hand

as because the minute hand technically touches the circumstance of the clock.