This tutorial provides a brief introduction about what area is, then gives the formulas for area of a square, rectangle, parallelogram, trapezoid, triangle, and circle. Examples of each formula are provided.

For this lesson on area and perimeter, 3rd graders will learn how to find the area and perimeter of rectangles by applying formulas.

In this lesson plan, 7th graders use the formula for circles to determine the area and perimeter.

This page brings you to a table of contents of three-dimensional figures. Selecting a figure will bring you to a page defining and illustrating the figure with applicable formulas listed.

The Math Forum offers an archive of question and answer sessions on circles and how they relate to geometry.

[Free Registration/Login Required] This flipchart provides a review of polygons and formulas for calculating perimeter and area in the form of assessment questions.

Explore and learn about the features and properties of a right triangle in this lesson. Includes examples and practice questions.

Introduces how to set up and solve simple geometric-figure word problems. Includes advice regarding formulas to memorize.

MathWorld provides multiple definitions and formulas for the mathematical term, square.