 | Charles Vyse - Arithmetic - 1785 - 350 pages
...738 Links long, and 583 in the Perpendicular, brings in 12/. a Y«ar. What ia it let at per Acre ? When the three Sides of a Triangle are given, to find the Area. RULE, 3. From Half the Burn of the three Sides fubtnuft each Side feverally ; multiply the Half Sura... | |
 | Charles Vyse - Arithmetic - 1806 - 342 pages
...Links long, and 583 in the Perpendicular, brings in 1'il. a Year. What is it let at per Acre ? Case 2. When the three Sides of a Triangle are given, to find the Area. RULE. 3. From Half the Sum of the three Sides subtract each Side severally ; multiply the Half Sum... | |
 | Thomas Keith - Navigation - 1810 - 478 pages
...these four logarithms, is the logarithmical sine of half the angle sought. (H. 215.) OR, RULE III. From half the sum of the three sides subtract each side separately. Then add together, The logarithmica! co-secants of half the sum of the sides, and of the difference... | |
 | Andrew Mackay - Mathematical instruments - 1811 - 162 pages
...easily measured by the above method. In this case, therefore, the three sides are to be measured. Now from half the sum of the th'ree sides, subtract each side separately; then extract the square root of the product of half the sum of the sides by the three differences ;... | |
 | Charles Butler - Mathematics - 1814 - 528 pages
...perpendicular CD falls without, or within the triangle. This inference is particularly useful in trigonometry, when the three sides of a triangle are given to find the angles. 2. Because DB=DE, and BE=2 BD, v AB.AE=(AB.AB+ BE-) AB.AB+ZBD=AI%a+2AB.BD; v since 5c|J—... | |
 | Thomas Keith - Navigation - 1826 - 504 pages
...these four logarithms, is the logarithmical sine of half the angle sought. (F. 184.) OR, RULE III. From half the sum of the three sides subtract each side separately. Then add together, The logarithmical co-secants of half the sum of the sides, and of the difference... | |
 | Edinburgh encyclopaedia - 1830 - 856 pages
...2.09477 Twice the area 17-675 2.24737 Г 8.8375 tq. ей. The area, . . \ ARPY 1=0 3 21 12.1 CASE III. When the three sides of a triangle are given to find the area. RULE. From half Ihe sum of the three sides subtract the tides severally. Multiply the hoff sum and... | |
 | Dudley Leavitt - Mathematics - 1830 - 154 pages
...the three sides of a triangle are given, the area may be found thus, without a perpendicular. Erom half the sum of the three sides, subtract each side separately ; multiply the half sum and 3 remainders continually together, and the square root of the last product will be the... | |
 | Ira Wanzer - Arithmetic - 1831 - 408 pages
...in Problem III. 2. When the three sides of the triangle are given, the area may be found as follows: From half the sum of the three sides subtract each side separately ; then multiply the said half sum and the three remainders continually together, and the square root... | |
 | Ireland commissioners of nat. educ - 1834 - 370 pages
...feet Gi inches. PROBLEM V. Having the three sides of any Triangle given, to find its orea. RULE I. 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 last product... | |
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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 area. 
