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 4 sides. x is, in this case, the length of the rectangle while y is the width of the rectangle.

The perimeter, P, is:

**P= x+x+y+y**

**P= 2x+2y**

**P= 2(x+y)**

### Example

Find the perimeter of this rectangle:

(in)

**P= 7+7+4+4**

**P= 2⋅7+2⋅4**

**P= 2⋅(7+4)**

**P= 2⋅11**

**P= 22in**

The area is the measurement of the surface of a shape. To find the area of a square or a rectangle you need to multiply the length and the width of a rectangle or a square.

Area, A, is x times y.

**A= x⋅y**

### Example

Find the area of this square.

(in)

**A= x⋅y**

**A= 5⋅5**

**A= 25in2**

There are different units for perimeter and area The perimeter has the same units as the length of the sides of rectangle or square whereas the area’s unit is squared.