Introduction to Similar Triangles

Let us understand what are similar triangles,
In general, to prove that two polygons are similar, you must show that all pairs of corresponding angles are equal and that all ratios of pairs of corresponding sides are equal. In triangles, though, this is not necessary.
Two angles of one triangle are equal to two angles of another triangle, then the triangles are similar.

Example 1: Use Figure 1 to show that the triangles are similar.

Figure 1 Similar triangles.

AA Similarity Postulate, Δ ABC ∼ Δ DEF. Additionally, because the triangles are now similar,

Hope the above explanation helped you.