Question

What criteria is needed to prove that objects are similar

Answer 1

The angles must be congruent.

Explanation:

I.e., If a triangles angles are 100, 40 and 40, and it's sides are 5, 7 and 7, A triangle that has the angles of 100, 40 and 40, but sides of 10, 14 and 14, is similar to the first triangle.