You can establish the size and shape of a triangle if you know two angle measurements and the length of the side between the angles (ASA). Two or more triangles are congruent if their corresponding parts coincide through the ASA criterion.
Answer:Typically 2 sides and 1 angle need to be given in order to determine a unique triangle. Alternatively 1 side and 2 angles, or the Cartesian coordinates of three vertices, or the area, base, and height. In any case 3 pieces of information.
