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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

## The Grammar-school Arithmetic: Being Book Second of the Analysis of Written ...

Stoddard A. Felter - 1868 - 340 ページ
...8 ft. X 2 = 16 sq. ft. Fig. 24. Prob. Hi — The sides of a triangle being given to find the area. Rule. — From half the sum of the three sides subtract each side separately, then multiply the continued product of these remainders by half the sum of the sides, and...

## Mensuration for Beginners: With Numerous Examples

Isaac Todhunter - 1869 - 296 ページ
...base, the quotient is the height. 152. The three sides of a triangle being given, to find the area. 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...

## A complete treatise on practical land-surveying

Anthony Nesbit - 1870
...or ^RR 15.30103 J ' -""-""~",l, Log. 4.332 . 0.63664 4 1.328 .J0 ARP 13.120 Ans. 4 1 13 PROBLEM HI. To find the area of a triangle when the three sides are given. From the half sum of the three sides subtract each side separately, add together the logarithms of...

## An elementary course of plane geometry and mensuration

Richard Wormell - 1870 - 276 ページ
...— Square the sides ; the area required is to the area given as the squares of the like sides. 13. To find the area of a triangle when the three sides are given, — Subtract each side separately from half the sum of the sides : multiply together the three remainders...

## Orton's Lightning Calculator and Accountant's Assistant

Hoy D. Orton - 1871 - 186 ページ
...it makes the corner a true right-angle. To find the area of any triangle when the three tides only are given. RULE. — From half the sum of the three sides subtract each side severally; multiply these three remainders and the said half sum continually together ; 'hen the square root of the last...

## Elements of Geometry and Trigonometry

Adrien Marie Legendre - 1871 - 187 ページ
...log sin \$A = £ [log (\$s — b) + log (£« — c) + (ac) log b + (a, c.) log c]. (3.) Third Case. To find the area of a triangle, when the three sides are given. Let ABC represent a triangle B whose sides a, b, and c are given. From the principle demonstrated in...

## Elements of Geometry and Trigonometry from the Works of A.M. Legendre ...

Charles Davies - 1872 - 455 ページ
...have, log sin \$A = \$ [log (}« — b) + log (J* — c) + (ac) log b + (ac) log c]. (3.) Third Case. To find the area of a triangle, when the •three sides are given. Let AJBC represent a triangle whose sides a, b, and c are given. From the principle demonstrated in...

## First book of mathematics

Hugo Reid - 1872 - 124 ページ
...feet, the altitude 153 feet. Ans. — 1 acre, 0 roods, 23 sq. poles, 6£ sq. yards. Problem 9. 343. To find the area of a triangle, when the three sides are known. Rule. — Add the three sides ; from the half sum subtract each side separately ; the area will...

## Mensuration of lines, surfaces, and volumes

David Munn - 1873
...and two triangles are to each other as the products of their bases by their altitudes. PROP. IV. — To find the area of a triangle, -when the three sides are given. In the triangle ABC, let BC = a, AC = b, AB = c. It is required to find the area. Let / denote the-...

## Surveying and Navigation, with a Preliminary Treatise on Trigonometry and ...

Aaron Schuyler - 1864 - 490 ページ
...respectively, and their included angle is 85° 40" 20" ; what is the area. Ans. 428470. 102. Problem. To find the area of a triangle when the three sides are given. By the last problem we find (1) k = \ be sin A, (2) sin A = 2 sin \ A cos \ A. Article 95, (5). (3)...