Question

10.1.1The hour hand of a clock moves from 3 to 9 o'clock. Through how many degrees does it move?

Answer 1

The number of rotation done by hour hand in 12 hr is 360 degree. So hour hand rotates in one hour is,

`(360)/(12)=30`

The number of hours covered by hour hand from 3 to 9 is 6 hours.

Determine the angle in degree for 6 hours rotation by hour hand.

`6\cdot30=180`

So hour hand moves by 180 degrees.