If a one-to-one correspondence between the parts of two figures is such that the corresponding parts are equal, then the figures are congruent. included angle 2. A situation for which each member of a set, such as angles of a triangle, can be paired with one and only one member of another set. 1 corresponding angles 3. Sides paired with one another in a one-to-one correspondence between figures. corresponding sides 4. The side of a triangle that is formed by the common side of two angles. included side 5. The angle formed by two sides of a triangle. one-to-one correspondence 6. Angles paired with one another in a one-to-one correspondence between geometric figures. congruent figures