### Did you know that squares, and rhombi are the only parallelograms with perpendicular diagonals? What makes different a square from a rhombus, if both have all sides congruent?

### This is an engaging lesson that will present a review for the properties of these two parallelograms, and then it will give you several examples; that go from very simple ones, up to one that involves solving a quadratic equation to find the angles in the rhombus. This lesson, while challenging is enjoyable! After each example a similar version is given; so you will be presented with a suggested problem to solve, to work it on the screen with your stylus and the marker tools menu.

** Lesson's Content **

** Lesson's Glossary **

**Angle **

Geometry 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 **

Any parallelogram that has 4 right angles.

** Rhombus **

Any parallelogram with 4 congruent sides.

**Segment **

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

**Square **

Parallelogram with four congruent sides and four congruent angles.

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