Calculating Areas for Parallelograms and Rectangles.

Maybe you know how to find the area of a square, or a rectangle; but what about when you are required to find the area of a rectangle when they give you one side in terms of the other side, and you realize that the simple formula won't be enough, and you will need to factor a quadratic equation? What about when you have to find the area of a square when you know the length of one of the diagonals, and you realize you need to apply special right triangles?

All along this lesson, you will work examples that illustrate very similar cases like the ones above described. You will be enabled to solve problems on your own, by writing directly on the screen. Specific slides have these problems and the space to work them using the marker tools menu on the top of the screen. The lesson is a great opportunity to become proficient in finding areas for parallelograms and rectangles!

Lesson's Content

Lesson In PDF Format (no animations)


Lesson's Glossary

The amount of space taken up in a plane by a figure.

Any quadrilateral with two pairs of opposite sides parallel.

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

Perimeter of a polygon
The sum of the lengths of the sides of the polygon.

A four-sided polygon.

Any parallelogram that has 4 right angles.


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