Books Books ... and 48° 15'? Ans. 6 A. 3 R. 18 P. PROBLEM V. To find the area of a triangle when the three sides are given. RULE. From half the sum of the three sides... A Treatise on Surveying and Civil Engineering, Wherein Everything that is ... - Page 7
by P. O'Shaughnessy (Civil engineer) - 1848 - 98 pages ## Watson's Tutor's assistant; or, Complete school arithmetic

William WATSON (of Beverley.) - 1845 - 188 pages
...diagonal measuring 2 chains. Ans. 3a. Or. 18p. PROBLEM 3. — To find the area of a triangle, when three sides are given. RULE. From half the sum of...sides, subtract each side severally, multiply the lialf sum, and the three • These, and the following, should be laid down with a plotting scale. t... ## The United States Arithmetic: Designed for Academies and Schools

William Vogdes - 1847 - 256 pages
...perches : how many acres does it contain ? PROBLEM XI. Given three sides of a triangle, to find the area. RULE. From half the sum of the three sides subtract...sum and the three remainders continually together, and the square root of the product will be the area required. EXAMPLES 1. What is the area of a triangle... ## A Complete Treatise on Practical Land-surveying: In All Its Departments ...

Anthony Nesbit - 1847 - 426 pages
...foregoing method. 4. When the three sides of a triangle are given, the area may be found as follows. From half the sum of the three sides subtract each...sum and the three remainders continually together, and the square root of the last product will be the area required. This method is too prolix, except... ## The Practical Engineer's Pocket Guide: Containing a Concise Treatise on the ...

1847 - 178 pages
...su53-25 XT7S I When only the three sides of a triangle can be given, to find the artaRule — Prom half the sum of the three sides subtract each side...severally ; multiply the half sum and the three remainders together, and the square root of the product is equal the area requiredRequired the area of a triangle,... ## The Decorator's assistant

458 pages
...that is, equal to 12 sq. in. PROBLEM III. To find the area of a triangle, whose three sides are given. From half the sum of the three sides subtract each side severally, then multiply the half sum and the three remainders continually together, and the square root of the... ## Principles of geometry, mensuration, trigonometry, land-surveying, and ...

Thomas Tate (mathematical master.) - 1848 - 284 pages
...perpendicular 25-25 ft. ? Ans. 68-736. 3. PROBLEM. To find the area of a triangle, given the three sides. RULE. From half the sum of the three sides subtract...sum and the three remainders continually together, and the square root of the last product will be the area of the triangle. (See Trigo. Art. 36.) . Note.... ## Principles of Architecture: Comprising Fundamental Rules of the Art, with ...

Peter Nicholson, Joseph Gwilt - 1848 - 756 pages
...PROBLEM III. PLATE 50. To find the area of a triangle whose three sides only are given. From the half sum of the three sides subtract each side severally; multiply the half sum and the three remainders together, and the square root of the product will be the area required. EXAMPLE I. Required the area... ## An Introduction to Mensuration and Practical Geometry

John Bonnycastle - 1848 - 288 pages
...Ans. 102.5ye. PROBLEM 111. To find the area of a triangle whose three sides only are given. RULE.* 1. From half the sum of the three sides subtract each side severally. * Demon. Let AC=iJ, AB=6, xc—c, and AD=ar/ (See preceding fig.) Then, since uii:=6 — x, we shall... ## The Mechanic's Assistant: A Thorough Practical Treatise on Mensuration and ...

D. M. Knapen - 1849 - 276 pages
...is 45 rods ? Ans. 5.48 acres. When the sides of H scalene triangle are given, to find its area : — From half the sum of the three sides subtract each side severally ; then multiply together the half sum of the three sides, and the three remainders, and extract the... 