Books Books 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 ## 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... ## 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... ## 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, toßnd 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... ## 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... ## 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... ## 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... ## 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.... ## 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.... ## 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... 