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... and 48° 15'? Ans. 6 A. 3 R. 18 P. PROBLEM V. To find the area of a triangle when the three sides are given. RULE. From half the sum of the three sides...
A Treatise on Surveying and Civil Engineering, Wherein Everything that is ... - Page 7
by P. O'Shaughnessy (Civil engineer) - 1848 - 98 pages

## Arithmetic, for use in schools

John Barter (of the science and art coll, Plymouth.) - 1877 - 328 pages
...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 Practical Arithmetic on the Inductive Plan: Including Oral and Written ...

William James Milne - 1877 - 402 pages
...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...

## The New American Arithmetic, Part 3

Samuel Mecutchen, George Mornton Sayre - 1877 - 200 pages
...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...

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

Stoddard A. Felter, Samuel Ashbel Farrand - 1877 - 496 pages
...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,...

## Elements of Geometry

George Albert Wentworth - 1881 - 266 pages
...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...

## Fish's Arithmetic Number One[-two]: Oral and Written ..., Volume 2

Daniel W. Fish - 1883 - 352 pages
...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...

## Fish's Arithmetic Number Two: Oral and Written, Upon the Inductive ..., Book 2

Daniel W. Fish - 1883 - 364 pages
...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...

## The Weston school manual

Colin Arrott R. Browning - 1884 - 274 pages
...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...