Question

In the diagram, △ABC≅△DEF.

Find the value of y.

Answer 1

If two triangles are similar, that means their angles are equal and their sides a proportional, so:

∠A = ∠D

`65 = 2y - 5\\ 65 + 5 = 2y\\ 2y = 65 + 5\\ 2y = 70\\ y = 35`

Therefore, y = 35, hope that helps!