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