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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
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Arithmetic, for use in schools

John Barter (of the science and art coll, Plymouth.) - 1877
...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...




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