To find the perimeter of a triangle, you need to add the lengths of all its sides together. Since each side of the triangle measures 0.75 inches and there are three sides, you can calculate the perimeter as follows:
\[ \text{Perimeter} = \text{side 1} + \text{side 2} + \text{side 3} = 0.75 + 0.75 + 0.75 \]
Calculating that:
\[ \text{Perimeter} = 0.75 \times 3 = 2.25 \text{ inches} \]
So, the perimeter of the triangle is 2.25 inches.