Students learn the formula for the area of a regular polygon, as well as the definitions of the center, a radius, a central angle, and an apothem of a regular polygon. Students are then asked to solve problems using the formula for the area of a regu...lar polygon. Note that right triangle formulas and trigonometry are used extensively in the problems in this lesson. (04:21)[more]

How to Calculate the Area of a Shape. Part of the series: Math Lessons and Study Tips. In order to calculate the area of a shape, the formula used depends on the particular shape. Use length times width to calculate the area of a rectangle.

Students learn the formula for finding the area of a trapezoid. The instructor uses a white board to demonstrate how to find the area of a trapezoid using a step-by-step approach. This is a clip of a larger video.

Learn how to compute the area and perimeter of complex figures. The teacher uses computer software for instruction. The screen becomes a little 'busy' so the viewer may want to open the video to 'full screen'.(05:48)

From pbslearningmedia.org, produced by Thirteen/WNET New York

In this Cyberchase video segment, Matt and Jackie must figure out how to construct rectangular lids that match the size of two boxes precisely. They enlist the carpentry skills of one of the Three Little Pigs, who shows them how to use different tool...s to accurately measure the rectangular lids. For the first box, Jackie finds that she can easily trace the box to make a lid that fits perfectly. The second box cannot be traced, so Matt and Jackie decide to measure the sides of the box and then use the measurements to cut a rectangle of equal size out of a piece of Herculanium. (4:11)[more]

Please make your comments on categories positive, and not just negative.

People work hard on educational categories, and we want to encourage them to make more!

Profanity (curse words), sexually suggestive remarks, and other such obviously inappropriate comments
will be deleted immediately, and are grounds for immediate expulsion. Remember, children use this website.

Personal criticism on project forums and in video content is not allowed and will be deleted immediately.
Any violations of this rule could result in expulsion from the project so please, no insults or other negative
personal remarks.

Very harshly-worded criticism of content will also be deleted promptly. Please use your vote to express your
harshest feelings. Repeated violations of this rule can result in expulsion. If you must criticize another
person's hard work, then be nice about it.

People work hard on educational categories, and we want to encourage them to make more!