10. Shapes and angles
10.05 Perimeter of rectangles
Lesson
Are you ready?
Do you remember how to find the perimeter of a shape?
Find the perimeter of the shape given.
Learn
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.
Apply
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.