Perimeter is the distance around an object. If you started at one point and went all the way around until you got to where you started, the perimeter.

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Presentation transcript:

Perimeter is the distance around an object

If you started at one point and went all the way around until you got to where you started, the perimeter is the total distance you have gone

What does THAT mean? The perimeter of a polygon is the sum of all of the sides

Polygon Is a shape Made of straight lines That is closed Polygons

Polygon Is a shape Made of straight lines That is closed These are NOT Polygons

A rectangle is definitely a polygon. Let’s say we have a rectangle 10 inches LONG and 4 inches WIDE = 28

Perimeter of a Rectangle L L W W L stands for the length W stands for the width

Perimeter of a Rectangle L L W W Perimeter = L + W + L + W Perimeter = 2 x L + 2 x W Perimeter = 2 L + 2W

Perimeter of other shapes 11 9 For a triangle, add up the length of each side = 31

Perimeter of other shapes ab c For a triangle, add up the length of each side If you called the length of each side a, b and c Perimeter = a + b + c

One more, for now All 4 sides of a square are the same length so … The perimeter of a square = 4 x length of a side Perimeter = 4 x 3 = 12