Bell Ringer  We know that opposite sides of parallelograms are both congruent and parallel. We know that opposite angles of parallelograms are congruent.

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Presentation transcript:

Bell Ringer  We know that opposite sides of parallelograms are both congruent and parallel. We know that opposite angles of parallelograms are congruent. We know the diagonals of a parallelogram bisect each other. We know that consecutive angles of a parallelogram are supplementary. We use what we know to prove that quadrilaterals are parallelograms. You will need to memorize this list!  COPY the Concept Summary on p. 340 in the Geometry book “ Proving Quadrilaterals are Parallelograms ”. You will need to memorize this list!

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Two-Column Proofs Ex. 2: StatementsReasons

Two-Column Proofs Ex. 3: StatementsReasons

Two-Column Proofs Ex. 4: StatementsReasons

Two-Column Proofs Ex. 5: StatementsReasons

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