- WatchMath Antics - Perimeter
- WatchFinding Perimeter
- WatchMath Antics - Area
- WatchPerimeter and Area of Irregular Shapes
- WatchArea and Perimeter of Irregular Shapes
The perimeter is the length of the outline of a shape. To find the perimeter of a rectangle or square you have to add the lengths of all the four sides. x is in this case the length of the rectangle while y is the width of the rectangle. The area is measurement of the surface of a shape.