1. Basics
2. Deductive Reasoning
3 - Parallel lines
4 - Congruent Triangles
5 - Quadrilaterals
6 - Inequalities
7 - Similar Polygon
8 - Rt. Triangles
9 - Circles
10 - Constructions
11 - Areas of 2D objects
12 - Areas and Volumes
13 - Coordinates

 

Trapezoids

Objective:

                • Learning about the properties of a trapezoid and an isosceles trapezoid.

 

Lesson 5-4 Trapezoids

             Trapezoid: A quadrilateral with exactly one pair of parallel sides

              Bases: Parallel sides of the trapezoid

              Legs: The other two sides of the trapezoid

  

              Isosceles trapezoid: A trapezoid with congruent legs

                Median: The segment that joins he midpoints of the legs

Theorem 5-18 Base angles of an isosceles trapezoid are congruent Angle A and Angle D are congruent because both legs are congruent   Theorem 5-19 The median of a trapezoid (1) is parallel to the bases; (2) has a length equal to the average of the base lengths. The length of segment EF is equal to the length of segment AB plus segment DC divide by two.

 

 

 

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