Question

What additional information do you need to prove GHI and DEF?

Answer 1

HI ≅ EF

Explanation:

There are 6 ways to know if 2 triangles are congruent

If any of these groups of corresponding measures are congruent, then the entire triangle is congruent:

SSS

SAS

ASA

AAS

HL

(s - side, a - angle, h - hypotenuse, l - leg)

The drawing shows a congruent side and a congruent angle, so if you had another side to make SAS, you could prove the triangles are congruent

HI ≅ EF makes SAS