Perimeter is the distance around the outside of a two-dimensional shape. The perimeter of a shape is the total length of the shape's sides. Perimeter is measured in units such as centimeters, inches, feet, yards, meters, kilometers, and miles.
To find the perimeter of any closed shape, add the lengths of all the sides.
Let's try it!
The perimeter of this triangle is highlighted.
To find the perimeter, add the lengths of all three sides.
The perimeter of the rectangle is highlighted.
To find the perimeter, add the lengths of all four sides.
