A conjecture and the flowchart proof used to prove the conjecture are shown. Given: J K L M is a parallelogram. Ray L N bisects angle K L P. Prove: Angle 1 is congruent to angle 3. Art: Parallelogram J K L M. Two rays L N and LP share an endpoint at vertex L. Ray L N extends horizontally right, continuing segment M L and forming an exterior angle K L N. Angle K L N is labeled 2. Ray L P extends diagonally right to the ray L N at vertex forming an exterior angle N L P. Angle N L P is labeled as 3.

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