0.5 cm, or half a centimetre is a distance that is approximately equal to one-fifth of an inch.
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That depends what you mean with "a 20 cm. circle". If 20 cm. is the radius, you already have the answer. If 20 cm. is the diameter, the radius is half the diameter. (10cm)
There are 2.54 centimeters (cm) in an inch (in).
Do you mean what are the dimensions because the perimeter has already been given? If so then: length = 8.5 cm and width = 5.5 cm Check: 8.5+8.5+5.5+5.5 = 28 cm
It means Centimeter- it's a unit of measure, like on a ruler.
4x4x6= 96; cm x cm x cm=cm3 ; answer is 96 cm3