21 cm = 8.26 inches
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21cm is about 8.27 inches.
Multiply cm by 0.394: 21cm x 0.394 = about 8.274 inches.
21 centimeters x 1 inch/2.54 centimeters = 8.267716535 inchesThere are 8.267716535 inches in 21 centimeters.
205mm = 20.5cm 21cm > 20.5cm
1/3 of 21cm = 1/3*21 = 7 cm