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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 Decorator's assistant

...that is, equal to 12 sq. in. PROBLEM III. To find the area of a triangle, whose three sides are given. From half the sum of the three sides subtract each side severally, then multiply the half sum and the three remainders continually together, and the square root of the... ## Principles of geometry, mensuration, trigonometry, land-surveying, and ...

...perpendicular 25-25 ft. ? Ans. 68-736. 3. PROBLEM. To find the area of a triangle, given the three sides. RULE. From half the sum of the three sides subtract...severally ; multiply the half sum and the three remainders continually together, and the square root of the last product will be the area of the triangle. (See... ## Principles of Architecture: Comprising Fundamental Rules of the Art, with ...

Peter Nicholson, Joseph Gwilt - 1848 - 280 ページ
...PROBLEM III. PLATE 50. To find the area of a triangle whose three sides only are given. From the half sum of the three sides subtract each side severally; multiply the half sum and the three remainders together, and the square root of the product will be the area required. EXAMPLE I. Required the area... ## A Treatise on Surveying and Civil Engineering, Wherein Everything that is ...

P. O'Shaughnessy (Civil engineer) - 1848 - 98 ページ
...triangle whose three sides measure 20. 41, 24. 16, and 30. 12 chains. Ans. 24* 2r OP. Second Limma to find the area of a triangle when the three sides are given. Square the sum of any two sides, take the square of the third side from it ; take the diffc. of the... ## An Introduction to Mensuration and Practical Geometry

John Bonnycastle - 1848 - 288 ページ
...Ans. 102.5ye. PROBLEM 111. To find the area of a triangle whose three sides only are given. RULE.* 1. From half the sum of the three sides subtract each side severally. * Demon. Let AC=iJ, AB=6, xc—c, and AD=ar/ (See preceding fig.) Then, since uii:=6 — x, we shall... ## A treatise on land surveying [ed.] by W. Galbraith

John Ainslie - 1849
...and contained angle, or two angles and adjacent side of triangles, are given to find the area. 1 . To find the area of a triangle when the three sides are given. Rule. — Add the three sides, and take half the sum. From the half sum subtract each side successively,... ## The Mechanic's Assistant: A Thorough Practical Treatise on Mensuration and ...

D. M. Knapen - 1849 - 276 ページ
...is 45 rods ? Ans. 5.48 acres. When the sides of H scalene triangle are given, to find its area : — From half the sum of the three sides subtract each side severally ; then multiply together the half sum of the three sides, and the three remainders, and extract the... ## A Rudimentary Treatise on Land and Engineering Surveying: With All the ...

Thomas Baker - 1850 - 218 ページ
...adjacent angles 60° 14' and 59° 46'; required the area by logarithms. Am. 13a. Ir. I2p. PROBLEM III. To find the area of a triangle when the three sides are given. Let a, b and c be the sides, and s their half sum, then A =: V s (s — a) (* — b) (s — c)By logarithms,... ## Elementary Geometry: With Applications in Mensuration

Charles Davies - 1850 - 216 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 each... ## An introductory treatise on mensuration, in theory and practice

John Radford Young - 1850 - 12 ページ
...and Altitude being given 21 To find the Area of a Triangle when the Base and Altitude are known 22 To find the Area of a Triangle when the Three Sides are known 24 Knowing any Two Sides of a Right-angled Triangle, to find the Third Side 28 To find the Area...