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A conjecture and the flowchart proof used to prove the conjecture are shown.

Given: A B C D is a parallelogram. Prove: Angle 1 is supplementary to angle 3. Art: Parallelogram A B C D. Ray D B is drawn and is extended past vertex B. The ray forms an interior angles A D B and D B C and an exterior angle labeled as 3, adjacent to angle D B C. Angle A D B is labeled as 1, and angle D B C is labeled as 2.



Drag an expression or phrase to each box to complete the proof.

A conjecture and the flowchart proof used to prove the conjecture are shown Given A B C D is a parallelogram Prove Angle 1 is supplementary to angle 3 Art Paral class=

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Answer:

1. Definition of parallelogram

Step-by-step explanation:

1. Definition of parallelogram

2. Angle Congruence Postulate

3. m<2 + m<3 =180

4. m<1 + m<3 =180

5. Definition of supplementary

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