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" Or, from 8 times the chord of half the arc, subtract the chord of the whole arc, and $ of the remainder will be the length of the arc, nearly. "
Cyclopedia of Architecture: Historical, Descriptive, Typographical ... - Page 285
by Robert Stuart - 1854
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Elementary Geometry

Geometry - 1973
...test the accuracy of the following approximate rule: — "To find the length of an arc, from eight times the chord of half the arc subtract the chord of the whole arc, and divide the result by three." (It will be necessary to measure the length of the chords.) Ex. 1319....
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The Sanitary Record, Volume 19

1897
...find the length of an arc, the chord of the arc, and the chord of half the arc being given — (12) From 8 times the chord of half the arc subtract the chord of the u>ho!c arc, and divide theremainder by 3. SUMMARY OF PROPERTIES OF THE CIRCLE. At this stage it may...
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