No, there is no full stop after cm. This is because cm isn't an abbreviation but a symbol; that is it represents centimetres, rather than being a shortening of centimetres.
You should include a single space between the number and the symbol (35 cm).
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The abbreviation cm means centimeter(s), which is one hundredth of a meter. 2.54 centimeters is an inch, and 1 centimeter is 10 millimeters.
The letters cm refer to centimeters, or 1/100th of a meter.
No, millimeters (mm) and centimeters (cm) are not the same. There are 10 millimeters in 1 centimeter.
None. The abbreviation cm represents one or more centimeters. In your question there are no numbers associated with the cm unit, therefore there are no significant figures.
Centimeters is a metric unit of length in the International System of Units (SI), equal to one hundredth of a meter. It is commonly used to measure smaller lengths or dimensions, such as the size of objects or distances.