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" 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 will be the area required. "
Higher Book - Page 252
by William Seneca Sutton - 1896
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Fish's Arithmetic Number One[-two]: Oral and Written ..., Volume 2

Daniel W. Fish - Arithmetic - 1883 - 352 pages
...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 is the...
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The Elements of Euclid, books i. to vi., with deductions, appendices and ...

Euclides - 1884 - 434 pages
...I. 41, 35 = Vs (s - a) (s - b) (s - c); which expression may be put into the form of a rule, thus : 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 will...
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A manual of commerce

William Waterston - 1884 - 298 pages
...feet : then 4fl X 18 = 810 square feet. 6. The three fides of a triangle being given, to▀nd the area: 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 will be the...
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The Weston school manual

Colin Arrott R. Browning - 1884 - 274 pages
...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 of this...
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The Elements of Geometry

George Bruce Halsted - Geometry - 1885 - 389 pages
...find the area of a triangle. 319 808. Given, the three sides, to find the area of a triangle. RULE. From half the sum of the three sides subtract each side separately ; multiply together the half -sum and the three remainders. The square root of this product is the...
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The Elements of Geometry

George Bruce Halsted - Geometry - 1886 - 394 pages
...find the area of a triangle. 319 808. Given, the three sides, to find the area of a triangle. RULE. From half the sum of the three sides subtract each side separately ; mult1ply together the half-sum and the three remainders. The square root of tltis product is the...
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Numbers Applied, a Complete Arithmetic, Part 1

Andrew Jackson Rickoff - Arithmetic - 1886 - 688 pages
...following rule is sometimes necessary : When the three sides of a triangle are given, to find the area : From half the sum of the three sides subtract each side separately. Multiply the half sum and the three remainders together, and extract the square root of the product....
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Practical Mensuration for Schools and Colleges

W. V. Wright - Measurement - 1887 - 74 pages
...Divide the circumference by 3.14159. When the three sides of a triangle are given, to find the area : From• half the sum of the three sides subtract each side separately. Multiply the half-sum and the three remainders together, and extract the square root of the product....
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Complete Arithmetic: Elements and Commercial. New Series

Christian Brothers - Arithmetic - 1888 - 482 pages
...2? 52 — 39 = 13 52 — 40 = 12 52 x 27 x 13 x 12 = 219024 Area = -v/219024 = 468 sq. yd. 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 continued...
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The National Question Book: A Graded Course of Study for Teachers and Those ...

Edward Richard Shaw - Examinations - 1887 - 360 pages
...— i 244. That which has length and breadth only. 245. Multiply the base by half the altitude. 246. From half the sum of the three sides subtract each side separately, multiply the half sum and the three remainders together, and extract the square root of the product....
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