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Squares, rectangles

Area = Length x Width

Length = 50'
Width = 30'
Area: 50' x 30' = 1,500 sq. ft.

Triangles

Area = .5 x Base x Height

Base = 40'
Height = 80'
Area: .5 x 40' x 80' = 1,600 sq. ft.

Circles

Area = 3.14 x (r x r)
r (radius) = 20'
Area: 3.14 x (20' x 20') = 1,256 sq. ft.

Irregular shapes

Divide area into smaller sections having familiar shapes (e.g., triangles A and D; rectangles B and C), then:

Area = Area A + Area B + Area C + Area D

A: .5 x 25' x 65' = 813 sq. ft.
B: 15' x 25' = 375 sq. ft.
C: 50' x 30' = 1,500 sq. ft.
D: .5 x 10' x 40' = 200 sq. ft.