It is 21 millimetres or 0.021 metres in length.
It is 17 to 21cm long
usually ranges from 17 to 21cm
205mm = 20.5cm 21cm > 20.5cm
Only if it's 3cm high!
21cm is about 8.27 inches.
1/3 of 21cm = 1/3*21 = 7 cm
A fifth of 21cm is 1/5 x 21 1/5 of 21 is 21/5, which is equal to 4.2 A fifth of 21cm is 4.2 cm
The approximate diameter of a circle whose circumference is 21cm is: 6.68cm
A4 is 29.7cm x 21cm A3 is 42cm x 29.7cm
2200mm
A = 1385cm2
area of a circle and the question is d=21cm