### 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! Don't miss the opportunity to take advantage of interacting with the lesson solving the suggested problems using your stylus and the marker tools menu.

** 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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