### How often when solving a problem that involves the properties of a parallelogram, have you felt lost?...How is this? Should I state that the angles are congruent, or that they are supplementary? Are the diagonals bisecting each other? How are the two consecutive angles?

### In the development of this lesson, you will be given many visual clues, and hints that will enable you to solve any problem that involves the properties of a parallelogram. Several of the explained examples take a great deal of an effort to show you the algebra that is involved, so that you don't get lost. This lesson is really on your side!

** Lesson's Content **

** Lesson's Glossary **

**Angle **

Geometric shape formed by two rays (initial and ending sides of the angle) that share a common endpoint called the vertex. You may name an angle using the vertex, or a point in each ray and the vertex label in the center.

**Parallelogram **

Any quadrilateral with two pairs of opposite sides parallel.

**Polygon **

It is a closed plane figure with a least three straight segments as sides.

**Quadrilateral **

A four-sided polygon.

**Rectangle **

A quadrilateral whose angles are all right angles.

**Segment **

Line segment; A section of a line, defined by two end points and all the points between them.

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