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6.2: Properties of Parallelograms. Objectives: To use relationships among sides and among angles of parallelograms To use relationships involving diagonals of parallelograms or transversals. THEOREM:. Opposite sides of a parallelogram ( ) are congruent. Example: Given EFGH.

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## 6.2: Properties of Parallelograms

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**6.2: Properties of Parallelograms**Objectives: To use relationships among sides and among angles of parallelograms To use relationships involving diagonals of parallelograms or transversals**THEOREM:**Opposite sides of a parallelogram ( ) are congruent.**Example: Given EFGH**Find GH and EG 7 E F 6 G H**Theorem:**Opposite angles of a are congruent. W V T U**EXAMPLE**C J 115 65 G H FIND measure of angle J and angle H.**Consecutive Angles**• Angles that share a side D C A B**In a parallelogram, consecutive angles are supplementary**(Because they are same-side interior angles!!) D C A B**Find the values of the variables.**b+7 c+4 2c 60° (3a)° 18**Theorem:**The diagonals of a bisect each other. E F K H G Example: If EK = 4 and HK = 7, find KG and KF**The figure below is a parallelogram.**Find the value of x. A 2x-1 AD=26 D**The figure below is a parallelogram. Find the values of x**and y. 2x+3 6y-16 4y 4x-9**Theorem:**If 3 or more parallel lines cut off congruent segments on one transversal, then they cut off congruent segments on EVERY transversal.

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