 | William Harris Johnston - 1865 - 478 pages
...Kirj.K. — Draw the diameter and the chord of the arc. Then, if the aro be less than a semi-circle, from eight times the chord of half the arc subtract the chord of the whole arc ; one-third of the remainder will be the length of the arc, nearly. In order to determine the chord... | |
 | Thomas Baker (C.E.) - 1865 - 174 pages
...to its length. CASE II. — When the chord of half and the whole arc are given. RULE II. — From 8 times the chord of half the arc subtract the chord of the whole arc, and take \ of the remainder for the lungth of the arc nearly. FORMULAE. (See last figure.) Put r = radius... | |
 | Leroy J. Blinn - Sheet-metal work - 1866 - 216 pages
...640 5625 -4- 2 = 820.28, &c.,feet the diameter. To find the Length of any arc of a circle. RULE. — From eight times the chord of half the arc, subtract the chord of the whole arc, and one-third of the remainder will be the length nearly. 9 • Required the length of the arc ABO, fig.... | |
 | Sir Rowland Macdonald Stephenson - Railroads - 1866 - 270 pages
...its length. CASE- II. — When the chord of half and of the whole arc are given. RULE II. — From 8 times the chord of half the arc subtract the chord of the whole arc, and take J of the remainder for the length of the arc nearly. 1 . To find the length of an arc of 30 degrees,... | |
 | C. Davies - 1867 - 342 pages
...length of the arc of a circle when the chord and radius are givenRULE I Find the chord of half the arcII From eight times the chord of half the arc, subtract...chord of the whole arc, and divide the remainder by 3, and the quotient will be the length of the arc, nearlyEXAMPLES 1 The chord AB=30 feet, and the radius... | |
 | Isaac Todhunter - Measurement - 1869 - 312 pages
...chord of an arc being known, and also the chord of half the arc, to find the length of the arc. RULE. From eight times the chord of half the arc subtract...the whole arc, and divide the remainder by three. This Rule is not cxict ; it gives the length of the arc smaller than it ought to be. if the arc subtend... | |
 | Sir Rowland Macdonald Stephenson - Railroads - 1869 - 446 pages
...its length. CASE II. — When the chord of half and of the whole arc are given. RULE II. — From 8 times the chord of half the arc subtract the chord of the whole arc, and take J of the remainder for the length of the arc nearly. 1. To find the length of an arc of 30 degrees,... | |
 | Alfred Hiley - 1871 - 184 pages
...less than a semicircle, when the chord of the arc and the diameter of the circle are given. From 8 times the chord of half the arc subtract the chord of the whole arc ; divide the remainder by 3, and the quotient is the length of the arc, nearly. Note 1. — The answers... | |
 | Mechanical engineering - 1874 - 1186 pages
...of the circumference to the area. To find the length of any are of a circle. — RULE 1. — From 8 times the chord of half the arc, subtract the chord of the whole arc ; one-third of the remainder will be the length of the arc, nearly. RULE 2. — As 180 is to the number... | |
 | James E. Ryan - Arithmetic - 1877 - 212 pages
...ABC MAY BE FOUND THUS : First find the chord of half the arc, and then proceed as follows : From 8 times the chord of half the arc subtract the chord of the arc, and divide the remainder by 3. EXERCISE CXXXIX. 1. A horse tied to a stake can graze an acre ;... | |
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From eight times the chord of half the arc, subtract the chord of the whole arc, and divide the remainder by 3, and the quotient will be the length of the arc, nearly. 
