| George Roberts Perkins - Arithmetic - 1851 - 356 pages
...the area of the trapezoid, which is the sum oi the two-triangles, may be found by the following E—- **RULE. Multiply half the sum of the two parallel sides by the** altitude. This rule has a fine application in measuring a tapering board, as A BCD. In this case half... | |
| Ezra S. Winslow - Business mathematics - 1853 - 264 pages
...83| rods. Ans. ' OF TRAPEZOIDS AND TRAPEZIUMS. To find the area of a trapezoid. RULE. — Multiply **the sum of the two parallel sides by the perpendicular distance between them,** and divide the product by 2 ; the quotient is the area. EXAMPLE. — The side AB, of the trapezoid... | |
| Benjamin Greenleaf - 1854 - 340 pages
...318. A TRAPEZOID is a quadrilateral, which has only one pair of its opposite sides parallel. ART. 319. **To find the area of a trapezoid. RULE. — Multiply half the sum of the** parallel sides by the altitude, and the product is the area. 1. What is the area of a trapezoid, the... | |
| Andrew Duncan (Surveyor) - Surveying - 1854 - 156 pages
...between B and C. Fences from F, G, and A, to P, trisect the farm, which is plain from the figure. 15th. **To find the area of a Trapezoid Rule, multiply half the sum of the** parallel sides by the perpendicular distance between them, and the product is the area. Let figure... | |
| Robert Stuart - Architecture - 1854 - 1272 pages
...when the square of 189 AB has been subtracted. 189 Prob. 4. To find the area of a trapezoid. Multiply **the sum of the two parallel sides by the perpendicular distance between them,** and half the product will be the area. Ex. In a trapezoid, the parallel sides are AB 7, and CD 12,... | |
| Elias Loomis - Trigonometry - 1855 - 192 pages
...to one fourth the square of one of its sides multiplied by the square root of 3. PROBLEM III. (87.) **To find the area of a trapezoid. RULE. Multiply half the sum of the** parallel sides into their perpendicular distance. For demonstration, see Geometry, Prop. 7, B. IV.... | |
| George Roberts Perkins - Arithmetic - 1855 - 382 pages
...Hence the area of the trapezoid, which is the sum of th« two-triangles, may be found by the following **RULE. Multiply half the sum of the two parallel sides by the** altitude. This rule has a fine application in measuring a tapering board, as ABCD. In this case half... | |
| Charles Guilford Burnham - 1857 - 336 pages
...three sides of a triangle are 6, 8, and 10 chains, What is the area ? Ans. 24 chains. Art. 271 . — **To find the area of a trapezoid. RULE. Multiply half...parallel sides by the perpendicular distance between them** : the product will be ilie area. 1. What is the area of a piece of land that is 30 chains long, 20... | |
| Charles Guilford Burnham - Arithmetic - 1857 - 328 pages
...three sides of a triangle are 6, 8, and 10 chains. What is the area ? Ans. 24 chains. Art. 271. — **To find the area of a trapezoid. RULE. Multiply half...sides "by the perpendicular distance between them** : the product will be the area. 1. What is the area of a piece of land that is 30 chains long, 20 chains... | |
| Charles Guilford Burnham - 1859 - 338 pages
...chains, What is the area ? Ans. 24 chains. Art. 271. — To find the area of a trapezoid. RULE. Jfultiply **half the sum of the two parallel sides by the perpendicular distance between them** : the product mil be the area. 1. What is the area of a piece of land that is 30 chains long, 20 chains... | |
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