| George Bruce Halsted - Measurement - 1881 - 258 pages
...Given the three sides of a triangle, to find the area. Eule ; From half the sum of the three sidles subtract each side separately; multiply the half sum...remainders together : the square root of the product will be the area. Formula : A — Vs (s — a) (s — b) (s — c). Proof: By 4, whence By 2, „ 2... | |
| Montagu H. Foster - 1881 - 182 pages
...2. Triangle. The area equals half the product of the %ase and perpendicular altitude. 3. Triaiigle. From half the sum of the three sides subtract each side separately, multiply the half sum by these three remainders, and extract the square root of the product. 4. Trapezium. The area equals... | |
| Robert Miller (M.A., of Edinburgh.) - Arithmetic - 1881 - 238 pages
...Area = base x perpendicular height. TRIANGLE: Area = a8e * p- — -, or from half the sum of the 4 three sides subtract each side separately. Multiply the half sum and the three remainders together, and take the square root of the product. SPHERE: Area=D" x 3-1416; solid contents = TI» x -5236 ;... | |
| Daniel W. Fish - Arithmetic - 1883 - 348 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...remainders together ; the square root of the product is the area. 3. Find the area of a triangle whose sides are 25, 36, and 49 in. 4. How many acres in... | |
| Daniel W. Fish - Arithmetic - 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 is the area.... | |
| William Dodds - 1883 - 202 pages
...find the length of the base. 69. To fiiid the area of a triangle when the three are given. RULE. 1°. From half the sum of the three sides subtract each side separately. 2°. Multiply the half sum and the throe remainders continually together. 3°. Take the square root... | |
| 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...remainders together; the square root of the product will be the ares. Ex. If the sides be S6, 28, and 30 Inches, we have 26 + 28 + 30 = 84, and ft 84 =42;... | |
| 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...multiply the half sum and the three remainders together, and the square root of the product will be the area.* 1. If from B there be drawn BE j_ AC or AC produced,... | |
| 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...separately ; multiply the half sum and the three remainders continually together, and the square root of this product will be the area of triangle. (16) In a right-angled... | |
| George Bruce Halsted - Geometry - 1885 - 389 pages
...vertex, to 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 area. FORMULA.... | |
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