# 6.2 Properties of Parallelograms - Honors Math 3

U1 Day 11 - Properties of Parallelograms A parallelogram is a quadrilateral with both pairs of opposite sides parallel. In a quadrilateral, opposite sides do not share a vertex and opposite angles do not share a side.

#1 Opp Sides // A parallelogram is a quadrilateral with both pairs of opposite sides parallel. #2 Opp Sides If a quadrilateral is a parallelogram, then its opposite sides are congruent.

#3 Opp Angles If a quadrilateral is a parallelogram, then its opposite angles are congruent. Def: Consecutive Angles Angles of a polygon that share a side are consecutive angles.

#4 - Consecutive Angles Supp If a quadrilateral is a parallelogram, then its consecutive angles are supplementary. Using Consecutive Angles A.

B. C. D. What is the measure of angle P in parallelogram PQRS? 26 64

116 126 mP mS 180 mP 64 180 mP 116

#5 Diagonals Bisect If a quadrilateral is a parallelogram, then its diagonals bisect each other. For example: Find Lengths Solve a system of linear equations to find the

values of x and y in parallelogram KLMN. What are KM and LN? Using Substitution to Find Lengths KP MP LP NP y 10 2 x 8

y 10 2( y 2) 8 y 10 2 y 4 8 10 y 4 14 y x 14 2 x 16

x y 2 RECTANGLES A rectangle is a parallelogram with: 4 Right Angles Diagonals

RHOMBUS A rhombus is a parallelogram with: 4 Congruent sides Diagonals Diagonals bisect

4 right angles 4 congruent sides

Diagonals Diagonals Diagonals bisect

each pair is made of two adjacent sides (they meet) that are equal in length. Angles are equal where the pairs meet. Diagonals are perpendicular Trapezoids A quadrilateral with exactly one pair of parallel sides.

The two parallel sides of the trapezoid are called the bases The consecutive angles between the bases of the trapezoid are supplementary Isosceles Trapezoid A trapezoid with two congruent legs In an isosceles trapezoid the non-parallel

sides are congruent Both sets of bases angles of an isosceles trapezoid are congruent (find one angle you can find them all) The diagonal of an isosceles trapezoid are congruent More Practice!!!!!

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