In order to get a ratio, we need to figure out how many of each of there are, for example "Thre are 13 boys in a class and 15 girls. What is the ratio of boys to girls?" The answer would be 13:15 since there are 13 boys and 15 girls.
If in triangles ABC and DEF, AB = DE, AC = DF, and angle A = angle D, then triangle ABC is congruent to triangle DEF. Using words: If 3 sides in one triangle are congruent to 3 sides of a second triangle, then the triangles are congruent.
