about 20 cm in length
Length of unsharpened pencil is measured in cm . km is a bigger quantity.
cm
Shoe size in cm. Person's height in m. Distance to Chicago in km.
They measure distance.
m
Length is used to measure distance or height. It is measured in km , m ,cm.
There are many units. Km,m,cm,miles,feet,inches are some
depends.... Kilometers (KM) or Meters (M) or if it was a toy train than... Centimeters (CM)
meters
1 km = 1000 m 1 m = 100 cm 1 cm = 10 mm
The conversion between km, m and cm are given .On finding the relation we get as follows . we know, 1 km=1000 m=100000 cm. from the above we can conclude , km > m > cm.