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To find circumference of a circle, multiply diameter by 3.1416.
 Weight Formulas Decimal Equivalents Converting Inches into Decimals of a Foot Terminology
To find diameter of a circle, multiply circumference by .31831.
To find area of a circle, multiply square of diameter by 0.7854.
Area of a rectangle = length multiplied by breadth. Doubling the diameter of a circle increases its area four times.
To find area of a triangle, multiply base by 1/222 perpendicular height.
Area of ellipse = product of both diameters times 0.7854.
Area of parallelogram = base times altitude.
To find side of an inscribed square, multiply diameter by 0.7071 or multiply circumference by 0.2251 or divide circumference by 4.4428.
Side of an inscribed cube = radius of sphere times 1.1547.
To find side of an equal square, multiply diameter by .8861 Square. A side multiplied by 14142 equals diameter of its circumscribing circle.
A side multiplied by 1.128 equals diameter of an equal circle.
A side multiplied by 3.547 equals circumference of an equal circle.
To find cubic inches in a ball, multiply cube of diameter by .5236.
To find cubic contents of a cone, multiply area of base by 1/3 the altitude.
Surface of frustrum of cone or pyramid = sum of circumference of both ends and get square root. Add the 2 areas and multiply 1/3 altitude.
Doubling the diameter of a pipe increases its capacity four times.
A gallon of water (U.S. standard) weighs 8 1/3 lbs. and contains 231 cubic inches.
A cubic foot of water contains 7 1/2 gallons, 1728 cubic inches, and weighs 62 1/2 lbs.
To find the pressure in pounds per square inch of a column of water, multiply the height of the column in feet by .434.
To find capacity of tanks any size, given dimensions of a cylinder in inches, to find its capacity in U.S. gallons: square the diameter, multiply by the length and by .0034.