## Area of Basic Shapes

**Area of a Square or Rectangle:**

Formula: Area = Length x Width

Length = 20'

Width = 10'

Formula = 10' x 20'

Area = 200 sq. ft.

**Area of a Right Triangle**

Formula: Area = 1/2 (base x height)

Base = 10'

Height = 10"

Formula = 1/2 x (10 x 10)

Area = 50 sq. ft.

**Area of a Circle:**

Formula: Area = π r² (pi x radius squared)

π = 3.141

r = 10'

Formula = 3.141 x 10 x 10

Area = 314.1 sq. ft.

## Area of an Irregular Shape

Section the irregular area into basic shapes. Calculate the area of each basic shape and add the areas for each together.

Rectangle: 50' by 40'

Area = 50 x 40 = 2,000 sq.ft.

Circle: radius = 41 '

Area = 3.14 x 41 x 41 = 5,278 sq.ft.

Triangle A = 20' by 20'

Area = 1/2 x (39 x 5) = 200 sq.ft.

Triangle B = 10' by 39'

Area = 1/2 x (39 x 5) = 97.5 sq.ft.

Total Area = 7,575.5 sq.ft.

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