USEFUL DATA |
To find circumference of a circle, multiply diameter by 3.1416. |
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To find diameter of a circle, multiply circumference by .31831. |
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To find area of a circle, multiply square of diameter by .7854 |
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Area of a rectangle = length multiplied by breadth. Doubling the diameter of a circle increases its area four times. |
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To find area of a triangle, multiply base by ½ perpendicular height. |
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Area of ellipse = product of both diameters times .7854. |
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Area of parallelogram = base times altitude. |
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To find side of an inscribed square, multiply diameter by 0.7071 or multiply circumference by 0.2251 or divide circumference by 4.4428. |
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Side of inscribed cube = radius of sphere times 1.1547. |
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To find side of an equal square, multiply diameter by .8862 Squared. A side multiplied by 1.4142 equals diameter of its circumscribing circle. |
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A side multiplied by 4.443 equals circumference of its circumscribing circle. |
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A side multiplied by 1.128 equals diameter of an equal circle. |
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A side multiplied by 3.547 equals circumference of an equal circle. |
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To find cubic inches in a ball, multiply cube of diameter by .5236. |
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To find cubic contents of a cone, multiply area of base by 1/3 the altitude. |
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Surface of frustrum of cone or pyramid = sum of circumference of both ends times ½ slant height plus area of both ends. |
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Contents of frustrum of cone or pyramid = multiply area of two ends and get square root. Add the 2 areas and multiply 1/3 altitude. |
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Doubling the diameter of a pipe increases its capacity four times. |
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A gallon of water (U.S. standard) weighs 8-1/3 lbs. and contains 231 cubic inches. |
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A cubic foot of water contains 7-1/2 gallons, 1728 cubic inches, and weighs 62-1/2 lbs. |
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To find the pressure in pounds per square inch of a column of water, multiply the height of the column in feet by .434. |
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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. |