Question

the minute hand of watch is 3cm long. how many cm,does its extremity move in 20 minutes? (useπ=3.14)​

Answer 1

Answer:

angle made by minute hand in 60 minutes =360degree

angle made by minute hand in 1 minute =360/60=6 degree

angle made by minute hand in 20 minutes=6×20=120degree

for plane angle convert degree into radian

plane angle =120×3.14/180=2.093radian

plane angle =length of arc/radius

radius =3cm

length=?

plane angle =length of arc/3

2.093=length/3

length=2.093×3=6.279

appropriate round off lenth=6.28