This video looks at using the properties of rectangles to calculate the perimeter. It also talks about some special notation that can be used to show when two sides have the same length.

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Find the perimeter of the rectangle shown.

Remember!

Because a rectangle has $2$2 pairs of sides with equal length, we can add the length and width, then double it, to find the perimeter of a rectangle.

A square is a special kind of rectangle, with $4$4 sides the same length, so we can multiply its side length by $4$4 to find the perimeter.

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3.MD.C.8

Solve real-world and mathematical problems involving perimeters of plane figures and areas of rectangles, including finding the perimeter given the side lengths, finding an unknown side length. Represent rectangles with the same perimeter and different areas or with the same area and different perimeters.

10.03 Perimeter of rectangles

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3.MD.C.8

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