Question

1. if three sides of one triangle are proportional to three sides of another triangle, the triangles are similar by side _ side similarity.

Explanation:

Step1: Recall the triangle similarity criteria

The Side - Side - Side (SSS) similarity criterion states that if the three sides of one triangle are proportional to the three corresponding sides of another triangle, then the two triangles are similar.

Answer:

side - to - side (SSS)