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9 centimeters is equivalent to 3.54330708661417 inches.

We know (by definition) that: 1 cm ≈ 0.39370079 in

We can set up a proportion to solve for the number of inches.

Now, we cross multiply to solve for our unknown x:

Conclusion: 9   cm ≈ 3.54330711   in

The inverse of the conversion factor is that 1 inch is equal to 0.282222222222222 times 9 centimeters.

It can also be expressed as: 9 centimeters is equal to 1 0.282222222222222 inches.

Approximation

An approximate numerical result would be: nine centimeters is about three point five four inches, or alternatively, a inch is about zero point two eight times nine centimeters.

Units involved

This is how the units in this conversion are defined:

Centimeters

A centimetre (symbol cm) or centimeter (American spelling) is a unit of length in the metric system, equal to one hundredth of a metre, centi being the SI prefix for a factor of1⁄100.

Inches

The inch (abbreviation: in or ″) is a unit of length in the imperial and United States customary systems of measurement now formally equal to 1⁄36 yard but usually understood as 1⁄12 of a foot. Derived from the Roman uncia (twelfth), inch is also sometimes used to translate related units in other measurement systems, usually understood as deriving from the width of the human thumb. Traditional standards for the exact length of an inch have varied in the past, but since the adoption of the international yard during the 1950s and 1960s it has been based on the metric system and defined as exactly 2.54 cm.

[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).

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