Complete the two-column proof. Identify the missing statement or reason. Type the letter of your answer in each blank.
| Given: |
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| Prove: | Quadrilateral IGRE is a parallelogram. |
Choices:
| a. | |
| b. | Given |
| c. | If both pairs of opposite angles of a quadrilateral are congruent, then the quadrilateral is a parallelogram. |
| d. | |
| e. | |
| f. | If two pairs of opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram. |
Proof:
| Statements | Reasons | ||||
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