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## 6.2 Properties of Parallelograms

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**6.2 Properties of Parallelograms**Chapter 6 Quadrilaterals**6.2 Properties of Parallelograms**• Theorem 6-1: Opposite sides of a parallelogram are congruent**Consecutive and Opposite Angles**• Consecutive Angles: Angles that share a side (Angles that are “next” to each other) • Opposite Angles: Angles that are across from each other in the parallelogram**6.2 Properties of Parallelograms**• Consecutive Angles are Supplementary because they are same-side interior angles**Using Consecutive Angles**• Find m<S in RSTW ST and RW are parallel, so <S and <R are what kind of angles? S T 68° W R**6.2 Properties of Parallelograms**• Theorem 6-2: Opposite angles of a parallelogram are congruent**Using Algebra**• Find the value of x in PQRS. Then find QR and PS. 3x - 15 R Q S P 2x + 3**Using Algebra**• Find the value of y in EFGH. Then find m<E, m<F, m<G, m<H. E F 3y + 37 6y + 4 G H**6.2 Properties of Parallelograms**• Theorem 6-3: The diagonals of a parallelogram bisect each other**Using Algebra**• Solve the system of equations to find the values of x and y. B C x + 1 2x 3y - 7 y D A**Using Algebra**• Solve the system of equations to find the values of x and y. Then find AE, EC, BE, and ED. B C x + 1 2x E 3y - 7 y D A**Using Algebra**• Find the values of a and b. X Y a 2a - 8 V b + 10 b + 2 Z W**Theorem 6-4**• Theorem 6-4: If three (or more) parallel lines cut off congruent segments on one transversal, then they cut off congruent segments on every transversal.**Measurement**• In the figure, DH ll CG ll BF ll AE, and AB = BC = CD = 2, and EF = 2.5. Find EH. H D 2 G C 2 F B 2 2.5 A E**Practice**• Pg 297 1-21, 24-33