 | Charles Haynes Haswell - Engineering - 1844 - 298 pages
...cd, and half the product will be the area. To find the Area of a Triangle by the length of its sides. RULE. — From half the sum of the three sides subtract each side separately ; then multiply the half sum and the \hree remainders continually together, and the square root of... | |
 | J. M. Scribner - Measurement - 1844 - 130 pages
...Isosceles Triangle is that which hss only two sides equal ; as J1BC in the adjoining figure. AB Ex. 3. What is the area of an isosceles triangle whose base is 20, and each of the equal sides 15? Jlns. 1 11.803. Ex. 4. How many square yards of plastering are there... | |
 | William Templeton (engineer.) - 1845 - 210 pages
...=206-34375 square feet, the area. When only the three sides of a triangle can be given, to find the area. Rule. — From 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... | |
 | William Watson (of Beverley.) - 1845 - 188 pages
...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 the three sides, subtract each side severally, multiply the lialf sum, and the three • These, and the following, should be laid down... | |
 | Charles Davies - Geometrical drawing - 1846 - 254 pages
...field are 49 chains, 50.25 chains, and 25.69 chains : what is its area ? Ans. 61 A. 1 R. 39.68 P. 4. What is the area of an isosceles triangle, whose base is 20, and each of the equal sides 15 ? Ans. 111.803. 5. How many acres are there in a triangle whose three... | |
 | William Vogdes - Arithmetic - 1847 - 324 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 each side severally. Multiply the half sum and the three remainders continually together, and the square root... | |
 | P. O'Shaughnessy (Civil engineer) - Civil engineering - 1848 - 110 pages
...feet ? Ans. 2748. 9. Prob. 5. To find the area of a plain triangle when the three sides are given. Rule. — From half the sum of the three sides subtract each side severally. Multiply the half sum and the three remainders continually together, the square root of... | |
 | 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 each side severally ; multiply the half sum and the three remainders continually together, and the square root... | |
 | William Templeton (engineer.) - 1848 - 256 pages
...base by a perpendicular let fall from the opposite angle, and take half the product for the area. Or, from half the sum of the three sides subtract each side separately, and multiply the three remainders so obtained and the half sum together, and the square root of the... | |
 | Charles Davies - Geometry - 1850 - 218 pages
...triangular field are 49 chains, 50,25 chains, and 25,69 : what is its area ? Ans. 61 A. 1 R. 39,68 P. 4. What is the area of an isosceles triangle, whose base is 20, and each of the equal sides 15 1 Ans. 111,803. 5. How many acres are there in a triangle whose three... | |
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RULE. — From half the sum of the three sides, subtract each side separately; multiply the half -turn and the three remainders together; the square root of the product is the area. 
