Final answer:
The correct conversion factors for inches to centimeters are 1 in : 2.54 cm and 2.54 cm : 1 in. These ratios are used for converting measurements between the two units.
Step-by-step explanation:
The conversion factors for inches to centimeters are based on the known equivalence that 1 inch equals 2.54 centimeters. Therefore, the correct conversion factors as ratios are:
- 1 in : 2.54 cm - This expresses that 1 inch is equivalent to 2.54 centimeters.
- 2.54 cm : 1 in - This conversion factor is simply the inverse of the first one, useful for converting centimeters to inches.
It is important to use the correct conversion factor based on what you are converting. If you are converting inches to centimeters you would use the first ratio, and vice versa for converting centimeters to inches.