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| Theorem 4 |
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| If a pair of opposite sides of a quadrilateral is equal and parallel, it is a parallelogram. |
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| ABCD is a quadrilateral. AB || DC and AB = DC. |
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| ABCD is a parallelogram. |
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| BC || AD |
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| Join AC and name the angles as shown |
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| We may use numbers or alphabets while referring to angles to make the proof easy. |
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