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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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The Complete Arithmetic: Oral and Written, 第 1 巻

Daniel W. Fish - 1874 - 516 ページ
...What is the area of an isosceles triangle whose base is 20 ft., and each of its equal sides 15 feet ? RULE. — From half the sum of the three sides, subtract each side separately ; multiply the half-surn ami the three remainders together; the square root of the product...

The Complete Arithmetic, Oral and Written: Second Part

Daniel W. Fish - 1874 - 272 ページ
...What is the area of an isosceles triangle whose base is 20 ft., and each of its equal sides 15 feet 1 RULE. — From half the sum of the three sides, subtract each side teparately ; multiply the half -sum and the three remainders together; the square root of the product...

A Practical Business Arithmetic ...

Lorenzo Fairbanks - 1875
...chains, and the perpendicular 18.25 chains ? PROBLEM III. 710. To find the area of a triangle when three sides are given. RULE. — From half the sum of the three sides subtract each side separately. Then multiply the half sum and the three remainders continually together, and the square...

Plane and Spherical Trigonometry and Mensuration

Aaron Schuyler - 1875 - 184 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)...

Mensuration for elementary and middle class schools

Henry Lewis (M.A.) - 1875 - 85 ページ
...CASE II. — The area of a triangle may, however, be determined from its three sides by the following rule: — From half the sum of the three sides, subtract each side separately; then multiply the half sum and the three remainders together, and the square root of the...

The Progressive Higher Arithmetic: For Schools, Academies, and Mercantile ...

Horatio Nelson Robinson - 1875 - 456 ページ
...of an isosceles triangle whose base is 20 ft., each of its equal sides 15 ft. ? Ans. 111.85 sq. 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...

Elements of Plane and Solid Geometry

George Albert Wentworth - 1877 - 398 ページ
...figure. § 424 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...

Complete Arithmetic: Comprising the New Intermediate Arithmetic and Part of ...

Stoddard A. Felter, Samuel Ashbel Farrand - 1877 - 471 ページ
...2d remainder. 27 — 24 = 3, 3d remainder. 27 X 15 X 9 X 3 = 10935. y 10935 = 104.57 sq. rds. 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,...

The New American Arithmetic, 第 3 部

Samuel Mecutchen, George Mornton Sayre - 1877
...preceding right triangle, AB is the hypotenuse, and AC, the perpendicular. To find the area of a triangle. 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 product...

The Practical Arithmetic on the Inductive Plan: Including Oral and Written ...

William James Milne - 1877 - 391 ページ
...the product of the base by the altitude. When the three sides are given, the following is the rule: RULE. — From half the sum of the three sides subtract each side separately. Multiply together the half sum and the three remainders, and extract the square root of...




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