ΔKGJ ∽ ΔIGH Two triangles are similar if an angle of 1 triangle is congruent to the angle of the other triangle and the sides containing these angles are in the same ratio. (Like "SAS" but for similar, not congruent, triangles) ∠1 ≅ ∠3 corresponding parts of similar triangles ∠1 ≅ ∠2 Given ∠2 ≅ ∠3 Angles congruent to the same angle are congruent EF ∥ HI If the alternate interior angles are congruent, then the lines are parallel.” Edwin