When two triangles are congruent, they will have the same three sides and the same three angles. The equal sides and angles may not be in the same position (if there is a turn or a flip), but they are there. ASA stands for "angle, side, angle" and means that we have two triangles where we know two angles and the included side are equal. If two angles and the included side of one triangle are equal to the corresponding angles and side of another triangle, the triangles are congruent. This chapter has important concepts like congruence of line segments, angles, triangles, congruence criteria and inequality relations.