9.+Perimeter,+Circumference,+and+Area

=Perimeter, Circumference, and Area= Objective: To find perimeters of rectangles and squares, circumferences of circles, and to find areas of rectangles, squares, and circles.

Visit Standards page to identify numbers. NCTM Standards: 1, 2, 3, 4, 6 CT Mathematics Standards: 2.1, 2.2, 3.1, 3.2, 3.3
 * Standards **

The //perimeter// of a polygon is the sum of the lengths of its sides. The //area// of a polygon is the number of square units in encloses. Try this: [].

Now use this applet to find the largest area a rectangle can be with a perimeter of 20: [|http://mste.illinois.edu/users/carvell/rectperim/RectPerim2.html.] What did you get? Put your answer in the discussion area.

Using the geoboard below, draw three different shapes that have a perimeter of 16. Next, find the areas. []


 * The measure of the outside of a circle is called its //circumference.//

The area of a circle is found by multiplying the radius squared times //pi//. The circumference is //pi// times the diameter.

More about pi can be found here: []. ||~ ||

Here are some problems about circumference and area of circles: []. Make sure to put how you did under the discussion tab.

How are perimeter, circumference, and area used in real life? Listen to this architect talk about how he uses them in his job. [|] []

Now you can use what you have learned. Try building this playground. [] Take a screen shot and upload it below.