The hypotenuse of a triangle was

2
2 cm and the hypotenuse of the final triangle was
1.3
1.3 cm. What is the scale factor?

The scale factor can be found by dividing the new hypotenuse by the original hypotenuse:

Scale factor = new hypotenuse / original hypotenuse
Scale factor = 1.3 cm / 2.2 cm

The scale factor is 0.59.