 | 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 with a plotting... | |
 | William Vogdes - Arithmetic - 1847 - 324 pages
...the height 12 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 of the product... | |
 | Anthony Nesbit - Plane trigonometry - 1847 - 492 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 side severally ; multiply the half sum and the three remainders continually together, and the square root of the last... | |
 | 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... | |
 | 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 of the last... | |
 | 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 the product... | |
 | John Bonnycastle - Geometry - 1848 - 320 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... | |
 | D. M. Knapen - Measurement - 1849 - 300 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... | |
 | John Radford Young - Measurement - 1850 - 294 pages
...Ans. 28-2 yards. PROBLEM IV. — To find the area of a triangle when all its 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 together, and the square root of the product of these... | |
 | Thomas Baker - Railroads - 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... | |
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RULE. From half the sum of the three sides subtract each side severally. 
