#### Area of a square / rectangle

Area = length x width

#### Area of a circle

Area = diameter x diameter x .7854

#### Surface area of a cone

Area = half of circumference of base x slant height + area of base

#### Area of ellipse

Area = short diameter x long diameter x 0.7854

#### Surface area of a cylinder

Area = diameter x 3.1416 x length x area of two bases

#### Area of a hexagon

Area = width of side x 2.598 x width of side

#### Area of a parallelogram

Area = length of base x distance between base and top

#### Surface area of a pyramid

Area = 1/2 the base perimeter x slant height + area of base

#### Surface area of a sphere

Area = diameter x diameter x 3.1416