To prove that the triangles are similar by the SAS similarity theorem, it needs to be shown that AC/GI = BC/HI.
Similarity theorem of triangle
Figures are known to be similar if the ratio of their similar sides is equal or their angles are equal.
From the given diagram, triangle ABC will be congruent to GHI if the ratio below is true.
AC/BC = GI/HI
This can also be written as AC/GI = BC/HI. Hence to prove that the triangles are similar by the SAS similarity theorem, it needs to be shown that AC/GI = BC/HI.
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