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McGraw Hill Integrated I, 2012

MH

McGraw Hill Integrated I, 2012 View details

7. Perimeter

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Exercise 1 Page P25

Perimeter is found by adding all of the sides lengths of a figure.

20m

Consider the given figure and its side length.

We want to find the perimeter of the figure. To do so, remember that the perimeter can be found by adding the lengths of all of the sides. In the given diagram, the hash marks indicate that all of the sides of the figure have equal lengths.

This means that our figure is a square. Because a square has four equal side lengths, we can multiply the length of one side s by 4 to find the perimeter. P=4s We can substitute s= 5 into the formula and simplify to find the perimeter.

P=4s

s= 5

P=4( 5)

Multiply

P=20

The perimeter of the square is 20m.

Extra

Formula for the Perimeter

We know that the perimeter is the distance around a figure. Since there are so many figures with different shapes, we can write a expression for the perimeter of each figure. Let's see some examples!

Be aware that the perimeter is always the sum of the side lengths, but we can simplify this by writing a formula for several figures.

Subchapter links

Exercises p.25-P25