10.02 Perimeter
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Can you add numbers together?
Solve $40+20+3$40+20+3
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The perimeter of a shape is the length around the outside of the shape.
If a shape is made up of unit squares, we can use those to count the distance around the outside of the whole shape. We count the outside edges of every unit square, making sure we include the whole outside of our shape.
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Question 1
Find the perimeter of the shaded region shown, where each square has a length of $1$1 unit.
$\editable{}$ units
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2D shapes are also known as polygons, and we've seen some of these shapes before. This video looks at how to work out the perimeter of any polygon by adding up the lengths of the sides.
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question 2
Find the perimeter of the figure shown.
We count the edge of every unit square, around the outside of our shape.
It doesn't matter what shape our polygon is, as long as we add the length of every side, we can work out the perimeter. We must also write the unit of measurement with our answers, such as cm, m, in or ft.