Surface Area Formulae

Area of a rectangle

Rectangle

Area = length X height

Area of a triangle

Triangle

Area = (length X height) / 2

Area of a circle

Circle

Circumference = 2π X radius OR π X diameter

Area = π(radius)² OR 0.7854 (diameter)²

Area of a triangle

Sphere

Surface area = π(diameter)²

Area of a cone

Cone

Surface area = (π X diameter X slope) / 2
+ area of base if solid (see circle above).

Area of a cylinder

Cylinder

Surface area = π X diameter X height
+ area of ends if solid (see circle above).

Area of a rectangular prism

Rectangular Prism

Surface area = 2(height X length) + 2(height X width) + 2(length X width)

π = 3.1416

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