## Perimeter and area of rectangles and squares

Rectangle and squares are quadrilaterals with four right angles.

With squares, all four sides are the same length, so the perimeter is four times the length of a side **a**.

$$P = 4a$$

In a rectangle, two pairs of opposite sides are of equal length **a, b**. The perimeter of a rectangle is given by the formula:

$$P = 2a + 2b$$

The area is given by formulae:

Square:

$$A=a×a=a^2$$

Rectangle:

$$A = a×b $$