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 ## A Rudimentary Treatise on Land and Engineering Surveying: With All the ...

Thomas Baker - 1850 - 244 pages
...has been made, and the work must be repeated. TO FIND THE AREA OF A TRIANGLE FROM THE THREE SIDES. RULE. From half the sum of the three sides subtract each side severally and reserve the three remainders; multiply the half sum continually by the three remainders, and the... ## The Practical Model Calculator: For the Engineer, Mechanic, Machinist ...

Oliver Byrne - 1851 - 310 pages
...A " " 7 J pa. = area required. To find the area of a triangle whose three sides only are given. — From half the sum of the three sides subtract each...sum and the three remainders continually together, and the square root of the product will be the area required Required the area of the triangle ABC,... ## A Theoretical and Practical Arithmetic: Designed for Common Schools and ...

Daniel Leach, William Draper Swan - 1851 - 280 pages
...is 80 yards ? 364. To find the area of a triangle, when the length of its three sides is known,— RULE. From half the sum of the three sides subtract each side separately. Then multiply the half sum by each side in succession. The square root of the continued... ## A Theoretical and Practical Arithmetic: Designed for Common Schools and ...

Daniel Leach - 1853 - 626 pages
...a triangle ? 364. To find the area of a^ triangle, when the length of its three sides is known, — RULE. From half the sum of the three sides subtract each side separately. Then multiply the half sum by each side in succession. The square root of the continued... ## The operative mechanic's workshop companion, and the scientific gentleman's ...

William Templeton (engineer.) - 1855 - 326 pages
...feet, the area. 2 When only the three sides of a triangle can t>e given, to find the area. Mule. — From half the sum of the three sides, subtract each...severally; multiply the half sum and the three remainders together, and the square root of the product is equal to the area required. Required the area of a... ## Elements of Plane and Spherical Trigonometry: With Their Applications to ...

Elias Loomis - 1855 - 192 pages
...feet, and the included angle 67° 15' ? Ans. (85.) When the three sides are known, we may use RULE III. 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. Demonstration.... ## The Mechanic's Text-book and Engineer's Practical Guide ...

1855 - 420 pages
...206-34375 square feet, the area. When only the three sides of a triangle can be given tn find the area. Rule. — From half the sum of the three sides subtract...severally ; multiply the half sum and the three remainders together, and the square root of th* product is equal the area required. Required the area of a triangle,... ## The North American Practical School Arithmetic: Particularly Adapted to the ...

David Price - 1858 - 266 pages
...? Ans. 9 acres 2 roods. VI. To find ike area of a triangle whose three sides are given. RULE 1. — From half the sum of the three sides, subtract each side severally. 2. — Multiply the three remainders and half the sum of the three sides together. 3. — The square... ## Mensuration and Practical Geometry: Containing Tables of Weights and ...

Charles Haynes Haswell - 1858 - 350 pages
...contain ? Ans. 74\$ yards. To ascertain the area of a Triangle by the length of its Sides (Figs. 6 and 7). 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... 