 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 area.  The New American Arithmetic - Page 109by Samuel Mecutchen, George Mornton Sayre - 1877Full view - About this book
 | Zadock Thompson - Arithmetic - 1848 - 184 pages
...— If the three sides only are given, add these togethe; and take half the sum ; from the half sum subtract each side separately ; multiply the half sum and the three remainders continually together, and the square root of the last product will be ths area of the triangle. li... | |
 | P. O'Shaughnessy (Civil engineer) - Civil engineering - 1848 - 110 pages
...feet ? Ans. 2748. 9. Prob. 5. To find the area of a plain triangle when the three sides are given. Rule. — From half the sum of the three sides subtract each side severally. Multiply the half sum and the three remainders continually together, the square root of... | |
 | William Templeton (engineer.) - 1848 - 256 pages
...base by a perpendicular let fall from the opposite angle, and take half the product for the area. Or, from half the sum of the three sides subtract each side separately, and multiply the three remainders so obtained and the half sum together, and the square root of the... | |
 | John Radford Young - Measurement - 1850 - 294 pages
...Ans. 28-2 yards. PROBLEM IV. — To find the area of a triangle when all its three sides are given. RULE. — From half the sum of the three sides subtract each side severally. Multiply the half sum and the three remainders together, and the square root of the product... | |
 | Thomas Baker - Railroads - 1850 - 244 pages
...has been made, and the work must be repeated. TO FIND THE AREA OF A TRIANGLE FROM THE THREE SIDES. RULE. From half the sum of the three sides subtract each side severally and reserve the three remainders; multiply the half sum continually by the three remainders,... | |
 | Daniel Leach - Arithmetic - 1851 - 280 pages
...is 80 yards ? 364. To find the area of a triangle, when the length of its three sides is known,— RULE. From half the sum of the three sides subtract each side separately. Then multiply the half sum by each side in succession. The square root of the continued product will... | |
 | James Elliot - 1851 - 152 pages
...the Three Sides are given. RULE. Add together the three sides, and halve the sum. From the half sum subtract each side separately. Multiply the half sum and the three remainders together. The square root of the product will be the area. NOTE 1. The first part of the work may be proved,... | |
 | Thomas Kentish - Geometrical drawing - 1852 - 272 pages
...separately; multiply the four remainders together; the square root •will be the area. For the triangle, from half the sum of the three sides subtract each side separately ; multiply the three remainders and the half sum together ; the square root will be the area. gram, and therefore... | |
 | Daniel Leach - Arithmetic - 1853 - 622 pages
...a triangle ? 364. To find the area of a^ triangle, when the length of its three sides is known, — RULE. From half the sum of the three sides subtract each side separately. Then multiply the half sum by each side in succession. The square root of the continued product will... | |
 | Thomas Kentish - Mathematical instruments - 1854 - 268 pages
...separately; multiply the four remainders together; the square root will be the area. For the triangle, from half the sum of the three sides subtract each side separately; multiply the three remainders and the half sum together ; the square root will be the area. gram, and therefore... | |
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