 | John Barter (of the science and art coll, Plymouth.) - 1877 - 328 pages
...journey is completed ? EXERCISE CCXV. Having the three sides of any triangle given, to find its area. Rule. — From half the sum of the three sides subtract each side separately, multiply the half sum and the three remainders together, and the square root of the last... | |
 | Edwin Pliny Seaver, George Augustus Walton - 1878 - 360 pages
...Rule. To find the area of a triangle : Multiply the base by the height, and divide the product by 2. To find the area of a triangle when the three sides are given : Find half the sum of the three sides; from this subtract each side separately; multiply together... | |
 | James Thomson - 1880 - 408 pages
...7 inches, and its perpendicular 17 feet 10 inches, what is its area? Answ. 192 f. 5' 5". RULE III. To find the area of a triangle, when the three sides are given: (1.) Add the sides together, and take half the sum : (2.) From the half sum take the three sides severally... | |
 | James Morton - 1881 - 236 pages
...scale of 8 inches. A quarter-sector of any circle is equal in area to a circle of half its diameter. To Find the Area of a Triangle when the Three Sides are given. — First. Add the three sides together, and take half their sum. Second. From this half sum subtract... | |
 | George Albert Wentworth - 1881 - 266 pages
...figure. § 424 QED GEOMETRY. — BOOK V. EXERCISES. 1. The area of any triangle may be found as follows : 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. Denote... | |
 | W T. Lawrence - 1882 - 76 pages
...To find the area of a triangle when the perpendicular and base are given. Base x perpendicular _ 2. To find the area of a triangle when the three sides are given. S = semiperimeter, or half the sum of all the eides. a, b, and с = the -a) (s-Ъ) (jc)=area. 3. To... | |
 | Daniel W. Fish - 1883 - 364 pages
...COO ft., area. 2. Find the area of a triangle whose base is 20 ft. and each of the other sides 15 ft. RULE. — From half the sum of the three sides subtract each side separately j multiply the half-sum and the three remainders together; the square root of the product... | |
 | Daniel W. Fish - 1883 - 348 pages
...6OO ft., area. 2. Find the area of a triangle whose base is 20 ft. and each, of the other sides 15 ft RULE. — From half the sum of the three sides subtract each side separately ; multiply the half -sum and the three remainders together ; the square root of the product... | |
 | Colin Arrott R. Browning - 1884 - 274 pages
...heightTT . , - 2 area He'Sht = T5T(15) When we know the length of each side, but not the perpendicular. Rule : — From half the sum of the three sides subtract each side separately ; multiply the half sum and the three remainders continually together, and the square root... | |
 | Charles Davies, Adrien Marie Legendre - 1885 - 538 pages
...log sin iA = i [log (is — b) + log (is — rj + 1a. c.) log b + (ac) logo]. • (B.) Third Case. To find the area of a triangle when the three sides are given. Let ABC represent a triangle whose sides a, b, and c are given. From the principle demonstrated in... | |
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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. 
