## 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:**

$$A = a×b $$