PERIMETER

Calculate the distance around shapes by adding all side lengths.

L3L4

CS.GO.3.1·Calculating the perimeter of geometric figures(III)CS.MU.3.1·Using units of measurement for length(III)

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WHAT IS PERIMETER?

Perimeter is the total distance around the outside of a shape. To find it, add up the lengths of all the sides. For a rectangle, there is a shortcut: Perimeter = 2 × (length + width), because opposite sides are equal.

Rectangle: 5 cm by 3 cm

1P = 2 × (length + width)

2P = 2 × (5 + 3)

3P = 2 × 8 = 16 cm

= 16

LEADER TIP

Walk the perimeter of the classroom! Relate perimeter to fencing a garden or framing a picture.

BEFORE THIS LESSON, TRY

Shapes & Properties

Place Value Addition

PRACTICE WITH THESE GAMES

Measurement Match

Shape Properties

Want more practice? Generate printable worksheets with similar problems.

Go to Worksheets

CONTINUE WITH:

Area

PERIMETER

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PERIMETER