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" RULE. From half the sum of the three sides subtract each side severally. "
The Theory and Practice of Surveying: Containing All the Instructions ... - Page 197
by Robert Gibson - 1811 - 508 pages
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Orton's Lightning Calculator and Accountant's Assistant

Hoy D. Orton - Ready-reckoners - 1871 - 202 pages
...the corner a true right-angle. To find the area of any triangle when the three tides only are given. RULE. — From half the sum of the three sides subtract each side severally; multiply these three remainders and the said half sum continually together ; 'hen the square root of...
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The Complete Arithmetic, Oral and Written: Second Part

Daniel W. Fish - Arithmetic - 1874 - 302 pages
...What is the area of an isosceles triangle whose base is 20 ft., and each of its equal sides 15 feet 1 RULE. — From half the sum of the three sides, subtract each side teparately ; multiply the half -sum and the three remainders together; the square root of the product...
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The Complete Arithmetic: Oral and Written

Daniel W. Fish - Arithmetic - 1874 - 300 pages
...What is the area of an isosceles triangle whose base is 20 ft., and each of its equal sides 15 feet ? RULE. — From half the sum of the three sides, subtract each side separately ; multiply the half-surn ami the three remainders together; the square root of the product...
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A Practical Business Arithmetic ...

Lorenzo Fairbanks - 1875 - 472 pages
...perpendicular 18.25 chains ? PROBLEM III. 710. To find the area of a triangle when three sides are given. RULE. — From half the sum of the three sides subtract each side separately. Then multiply the half sum and the three remainders continually together, and the square...
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The Progressive Higher Arithmetic: For Schools, Academies, and Mercantile ...

Horatio Nelson Robinson - Arithmetic - 1875 - 468 pages
...of an isosceles triangle whose base is 20 ft., each of its equal sides 15 ft. ? Ans. 111.85 sq. ft. RULE, from half the sum of the three sides subtract each side separately ; multiply the half-sum and the three remainders together ; the square root of the product...
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Mensuration for elementary and middle class schools

Henry Lewis (M.A.) - Measurement - 1875 - 104 pages
...CASE II. — The area of a triangle may, however, be determined from its three sides by the following rule: — From half the sum of the three sides, subtract each side separately; then multiply the half sum and the three remainders together, and the square root of the...
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Arithmetic, for use in schools

John Barter (of the science and art coll, Plymouth.) - 1877 - 328 pages
...the journey is completed ? EXERCISE CCXV. Having the three sides of any triangle given, to find its area. Rule. — From half the sum of the three sides subtract each side separately, multiply the half sum and the three remainders together, and the square root of the last...
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Complete Arithmetic: Comprising the New Intermediate Arithmetic and Part of ...

Stoddard A. Felter, Samuel Ashbel Farrand - Arithmetic - 1877 - 496 pages
...= 9, 2d remainder. 27 — 24 = 3, 3d remainder. 27 X 15 X 9 X 3 = 10935. y 10935 = 104.57 sq. rds. area. RULE. — From half the sum of the three sides subtract each side separately ; then multiply the continued product of these remainders by half the sum of the sides,...
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The Practical Arithmetic on the Inductive Plan: Including Oral and Written ...

William James Milne - Arithmetic - 1877 - 402 pages
...the product of the base by the altitude. When the three sides are given, the following is the rule: RULE. — From half the sum of the three sides subtract each side separately. Multiply together the half sum and the three remainders, and extract the square root of...
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Elements of Plane and Solid Geometry

George Albert Wentworth - Geometry - 1877 - 416 pages
...figure. § 424 GEOMETRY. — BOOK V. EXERCISES. 1. The area of any triangle may be found as follows : From half the, sum of the three sides subtract each side severally, multiply together the half sum and the three remainders, and extract the square root of the product....
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