# Area Formulas

Area is the size of a two-dimensional surface. It is defined as the amount of two-dimensional space occupied by an object. Area formulas have many practical applications in building, farming, architecture, science. The area of a shape can be determined by placing the shape over a grid and counting the number of squares that covers the entire space. For example, the area of a square can be calculated using $a^{2}$ where a is the length of its side.

List of Formulas

 Figures Formula Variables Rectangle Area = l $\times$ w l =  length w  = width Square Area  = $a^{2}$ a = sides of square Triangle Area = $\frac{1}{2}$bh b = base h = height Circle Area = $\pi$$r^{2}$ r = radius of circle Trapezoid Area =$\frac{1}{2}$(a + b)h a = base 1 b = base 2 h = vertical height Ellipse Area = $\pi$ab a = radius of major axis b = radius of minor axis