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 書籍 To find the Area of a Triangle when the Three Sides are given. Rule. — From half... の書籍検索結果 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. A Treatise on Surveying, Containing the Theory and Practice: To which is ... - 97 ページ
John Gummere 著 - 1814 - 346 ページ ## Arithmetic, for use in schools

...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... ## The Franklin Written Arithmetic: With Examples for Oral Practice

Edwin Pliny Seaver, George Augustus Walton - 1878 - 348 ページ
...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... ## A treatise on arithmetic. [With] Key, 第 1 巻

James Thomson - 1880
...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... ## The System of Calculating Diameter, Circumference, Area, and Squaring the ...

James Morton - 1881 - 216 ページ
...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... ## Elements of Geometry

George Albert Wentworth - 1881
...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... ## Pupil-teachers' Mensuration Questions. ...

W. T. Lawrence - 1882 - 63 ページ
...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... ## Fish's Arithmetic Number Two: Oral and Written, Upon the Inductive Method, 書籍 2

Daniel W. Fish - 1883 - 352 ページ
...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... ## Fish's Arithmetic Number One[-two]: Oral and Written ..., 第 2 巻

Daniel W. Fish - 1883
...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... ## The Weston school manual

Colin Arrott R. Browning - 1884
...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... ## Elements of Geometry and Trigonometry from the Works of A.M. Legendre ...

Charles Davies, Adrien Marie Legendre - 1885 - 512 ページ
...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...