The addition of the three interior angles of a triangle is equal to 180°.
Considering triangle JMR, we get:

Substituting with the data provided in the diagram:

Considering triangle KNP, we get:

Substituting with the data provided in the diagram:

In consequence, the next angles are congruent:

Applying the AAA similarity theorem, then triangles JMR and NPK are similar.
A similarity ratio is the ratio of the lengths of the corresponding sides of two similar polygons.
The similarity ratio of triangle JMR to triangle NPK is:

The similarity ratio of triangle NPK to triangle JMR is:
