Circular Measure
Description
This section is from the book "Scientific American Reference Book. A Manual for the Office, Household and Shop", by Albert A. Hopkins, A. Russell Bond. Also available from Amazon: Scientific American Reference Book.
Circular Measure
Diameter of a Circle X 3.1416 gives Circumference.
Diameter Squared X .7854 gives Area of Circle.
Diameter Squared X 3.1416 gives Surface of Sphere.
Diameter Cubed X .5236 gives Solidity of Sphere.
One Degree of Circumference X 57.3 gives Radius.
Diameter of Cylinder X 3.1416, and product by its length, gives the Surface.
Diameter Squared X .7854, and product by the length, gives Solid Contents.
A Circular Acre is 235.504 feet, a Circular Rood 117.752 feet, in diameter. The Circumference of the globe is about 24,855 miles, and the Diameter about 7,900 miles. - Whittaker's Almanac.
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