It is three quarters of the way from the 3 inch mark towards the 4 inch mark.
Imperial rulers are normally marked in 16th of an inch with the 4th and 12th marks slightly longer and the 8th even longer. The 4th mark is ¼, the 8th mark is ½ and the 12th mark is ¾; 3.75 inches is 3¾ inches so on such a ruler it is the 12th mark to the right of the 3, and will be slightly longer than the 3 marks either side of it.
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On a standard ruler, 3.75 inches would fall between the 3 and 4-inch marks. Each inch on a ruler is divided into 16 equal parts, so 0.75 inches is three-quarters of an inch. Therefore, 3.75 inches would be three complete inches plus three-quarters of an inch.
Where is 3.75 inches on a ruler
the 9th mark on a ruler in inches is 9/16 inches for centimeters its 9/10 cm.
It is 2.25 inches - whether on a ruler or on a measuring tape or whatever.
Whether on a ruler or anywhere else, it is still 1.35 inches. No ruler is graduated with at that level of detail. A tenth of an inch is typical. So you want a point halfway between 1.3 inches and 1.4 inches. Alternatively, you can draw a line of 1.35*2 = 2.7 inches (the ruler will measure that) and then bisect it.
1 ruler (12 inches) is 30.48cm
On a 12 inch ruler, the 1/3 point would be 12/3, or at 4 inches.