Geometry/Similar Triangles

For two triangles to be similar, all 3 corresponding angles must be congruent, and all three sides must be proportionally equal. Two triangles are similar if...
 * Two angles of each triangle are congruent.
 * The acute angle of a right triangle is congruent to the acute angle of another right triangle.
 * The two triangles are congruent. Note here that congruency implies similarity.