Lessons

1. Basics
2. Deductive Reasoning
3 - Parallel lines
4 - Congruent Triangles
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.

Quickie Math Copyright (c) 2000 Team C006354