There's a little trick in this question! You're asking to convert centimeters to inches, but "5 and a half cm" is already a measurement in centimeters.

Here's how to do the conversion:

* 1 inch is equal to 2.54 centimeters.

* To convert centimeters to inches, divide the number of centimeters by 2.54.

So, to convert 5 and a half centimeters (5.5 cm) to inches:

5.5 cm / 2.54 cm/inch = 2.165 inches (approximately)