Determine the scale factor for the similar triangles 11.25 & 15 cm wide

To determine the scale factor, we need to compare the corresponding sides of the similar triangles.

Let's assume that the length of the corresponding side in the smaller triangle (11.25 cm wide) is x cm.

Then, the length of the corresponding side in the larger triangle (15 cm wide) is 15 cm.

Since the triangles are similar, we can set up a proportion:

x/11.25 = 15/15

Simplifying, we get:

x/11.25 = 1

Cross multiplying, we get:

x = 11.25

Therefore, the scale factor for the similar triangles is 11.25:15, which simplifies to 3:4.