[size=150]If two angles in one triangle are each congruent to two angles in another triangle, then their[br]third angles must be congruent.[/size]

[size=100][size=150][justify][/justify][/size][/size][size=150][size=100][justify]If exactly one angle in one triangle is congruent to one angle in another triangle, then the triangles are similar.[/justify][/size][/size]

[size=100]If all the corresponding angles in two triangles are congruent, then the triangles are similar.[/size]

Every triangle that has two congruent sides always has two congruent angles.

If two sides in a triangle are proportional to two corresponding sides in another triangle, then the triangles are similar.

If two triangles have all their corresponding sides proportional, then the triangles are similar.