# Parallelograms - Part 2

Parallelograms Part 2 Proving quadrilaterals are parallelograms Geometry Chapter 6 A BowerPoint Presentation In a quadrilateral, if both pairs of opp sides are , then

(A repeat of the definition of parallelograms) If AB CD and AC BD Then ABCD is a In a quadrilateral, if both pairs of opp sides are , then If AB CD and AD Then ABCD is a

BC In a quadrilateral, if both pairs of opp s are , then If A C and

B Then ABCD is a D In a quadrilateral, if one pair of opp sides are both & , then If AB

DC and AB Then ABCD is a DC In a quadrilateral, if both diagonals bisect each other, then If AM

MC and BM Then ABCD is a MD In a quadrilateral, if one is supp to both of its consecutive s, then

If m A + m B = 180 and m A +m D = 180 Then ABCD is a

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