Question

1. choose one side that corresponds to side ab in triangle abc. *correspond means \matching\.

Explanation:

Step1: Identify similar - right - angled triangles

In the figure, assume there are similar right - angled triangles formed. Side AB is part of a right - angled triangle at the corner. Side DE is also part of a right - angled triangle at the corner with similar orientation and position relative to the overall figure.

Answer:

DE