A ruler
It look like 1.93
where is .39 on a ruler
45mm.
2.5 cm looks like about 1 inch on a ruler
i inch
A ruler
45mm = 4.5cm
On a standard ruler, 1.4 cm would be represented by a mark slightly past the 1 cm mark and just before the 1.5 cm mark. Each centimeter is divided into 10 equal parts called millimeters, so 1.4 cm would be 14 millimeters from the start of the ruler. It would be closer to the 1 cm mark than the 2 cm mark.
1.77 inches
one and 1/4
6.14" is the length of a U.S. Dollar bill. Measure it with your ruler.