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93

To compute the area of a square, rectangle or parallelogram.

Multiply the length by the width.

To compute the area of a triangle.

Multiply the length of the base by 1/2 of the

perpendicular height.

To compute the diameter of a circle.

Multiply the circumference by .31831.

To compute the circumference of a circle.

Multiply the diameter by 3.1416.

To compute the area of a circle.

Multiply the square of the diameter by .7854.

To compute the cubical contents of any solid.

Multiply the length by the breadth (or height) by

the thickness, viz., 42’6 length x 3’3” height x

2’4” thick - 322.245 cubic ft. If the number of

cubic yards is required, divide the answer in

cubic feet by 27, as there are 27 cubic feet in a

cubic yard.

To compute the surface of a sphere.

Multiply the square of the diameter by 3.1416.

To convert Celsius to Fahrenheit.

Multiply the degrees of Celsius by 9, divided by

5 and add 32.

To convert Fahrenheit into Celsius.

Subtract 32 from the decrees of Fahrenheit,

multiply by 5 and divide by 9.