To convert centimeters to inches, multiply the length in centimeters by 0.393701.
55 cm = 55 × 0.393701 = 21.65 inches
40 cm = 40 × 0.393701 = 15.75 inches
23 cm = 23 × 0.393701 = 9.06 inches
So, the conversions are:
55 cm = 21.65 inches
40 cm = 15.75 inches
23 cm = 9.06 inches