In each of the given pairs of triangles, find which pair of triangles are similar. State the similarity criterion and write the similarity relation in symbolic form.

Question

Philoid · Accepted Answer

In these triangles ABC and PQR, observe that

∠BAC = ∠PQR = 50°

∠ABC = ∠QPR = 60°

∠ACB = ∠PRQ = 70°

Thus, by angle-angle-angle similarity, i.e., AAA similarity,

∆ABC ∼ ∆PQR