Perimeter is a math concept that measures the total length around the outside of a shape. To find the perimeter, you add together the lengths of all the sides. This works for any shape, including triangles, …

What I want to do in this video is a fairly straightforward primer on perimeter and area. And I'll do perimeter here on the left, and I'll do area here on the right.

Perimeter is a math concept that measures the total length around the outside of a shape. To find the perimeter, you add together the lengths of all the sides. This works for any shape, including triangles, …

What's the difference between area and perimeter? Area is the amount of space inside a shape, while perimeter is the distance around the outside of a shape.

Area and perimeter help us measure the size of 2D shapes. We’ll start with the area and perimeter of rectangles. From there, we’ll tackle trickier shapes, such as triangles and circles.

Get ready to draw the line--the perimeter line, that is! This unit will walk you through everything you need to know about measuring the distance around shapes and finding out how big (or small) they really are.

To find the perimeter of a shape, you add up the lengths of all the sides. For a square or pentagon, it's even easier - you can multiply the length of one side by the number of sides to get the total perimeter.

Each square on the grid is 1 unit square. What is the perimeter of the shaded rectangle?

Area and perimeter help us measure the size of 2D shapes. We’ll start with the area and perimeter of rectangles. From there, we’ll tackle trickier shapes, such as triangles and circles.

How do we calculate the perimeter of a shape? To find the perimeter of a shape, we add all of the shape's side lengths.