Perimeter of Rectangles Lesson 16a. Perimeter Perimeter is the distance around the outside of a...

Perimeter of RectanglesLesson 16a

Perimeter

Perimeter is the distance around the outside of a figure.

The perimeter of a rectangle is derived by adding all four sides. Since the two lengths are equal, and the two widths are equal, then it can be written as P = 2l + 2w.

For squares, the perimeter is found the same way (add all 4 sides). Since all sides are the same, however, you can use the formula P = 4s.

Example18 cm

5 cm 5 cm

P = 2w + 2lP = 2(5) + 2(18)P = 10 + 36P = 46 cm

Perimeter results in regular units, not square units.

Practice Time

Perimeter of Rectangles Lesson 16a. Perimeter Perimeter is the distance around the outside of a...

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