 | Charles Davies - 1850 - 218 ページ
...a triangle whose base is 72,7 yards, and altitude 36,5 yards ? Ans. 1326,775 sq. yds. PROBLEM III. To find the area of a triangle when the three sides are known. RULE, I. Add" the three sides together and take half their sum. II. From this half sum take... | |
 | Oliver Byrne - 1851 - 310 ページ
...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...severally. Multiply the half sum and the three remainders continually together, and the square root of the product will be the area required Required the area... | |
 | James Elliot - 1851 - 152 ページ
...side of the base being 35 feet; and the perpendicular height 42 feet?* Ans. 4410 sq. ft. PROBLEM V. To find the Area of a Triangle when the Three Sides are given. RULE. Add together the three sides, and halve the sum. From the half sum subtract each side separately. Multiply... | |
 | Horace Mann - 1851 - 384 ページ
...frustum, &c.) ; ub the upper base. 1. THE PARALLELOGRAM. a = bx al. 2. THE TRIANGLE. a = — -?-. H To find the area of a triangle, when the three sides are given : I. Add the three sides together, and take half their sum. II. From this half sum take each side separately.... | |
 | Daniel Leach - 1851 - 280 ページ
...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... | |
 | Horatio Nelson Robinson - 1851 - 96 ページ
...TRIGONOMETRICAL THEOREMS AND PROBLEMS. In all works on Surveying, we find the following rule for determining the area of a triangle when the three sides are given. RULE. Find the half sum of the three sides, and from said half sum take each side severally, thus obtaining... | |
 | Daniel Leach - 1853 - 622 ページ
...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... | |
 | William Templeton (engineer.) - 1855 - 326 ページ
...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... | |
 | Elias Loomis - 1855 - 192 ページ
...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.... | |
 | William Smyth - 1855 - 234 ページ
...16f(s— c) (s— i) (s — a). Dividing next both sides by 16 and extracting the square root, Hence, to find the area of a triangle when the three sides are given ; Subtract successively each side from the half sum of the sides ; multiply together the half sum and... | |
| |
To find the Area of a Triangle when the Three Sides are given. Rule. — From half the sum of the three sides subtract each side separately. 
