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To find the area of a trapezoid. RULE. Multiply half the sum of the two parallel sides by the perpendicular distance between them : the product will be the area.
A System of Geometry and Trigonometry: Together with a Treatise on Surveying ... - Page 33
by Abel Flint - 1804 - 168 pages

## Notes on Military Surveying and Reconnaissance

William Paterson (Lieut.-Col.) - Military topography - 1882 - 204 pages
...perpendicular, and half the product will be the area. ~. = Triangla To find the area of a trapezoid : — Multiply half the sum of the two parallel sides by the perpendicular distance between them for the area. — - — a = Trapezoid. To find the area of a trapezium : — Multiply the diagonal...

## A Practical Treatise on the Law of Auctions: With Forms, Rules for Valuing ...

Joseph Bateman - Auctions - 1882 - 576 pages
...convenient number of feet and inches. For a Trapezoid (two of the sides parallel, but not equal).—Multiply half the sum of the two parallel sides by the perpendicular distance between them. For a Trape.zinm (four straight sides of different lengths).—Obtain a diagonal, by measuring from...

## Mensuration for beginners [With] Answers

William Dodds - 1883 - 202 pages
...area of a trapezoid when the parallel sides and the perpendicular distance between them are given. RULE. Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the product will be the area. If two straight "iT lines are of unequal ! / length, the average...

## Useful rules and tables relating to mensuration, engineering, structures and ...

William John Macquorn Rankine - 1883 - 452 pages
...by a pair of' parallel straight lines, and a pair of straight lines not parallel). Multiply the half sum of the two parallel sides by the perpendicular distance between them. 3. Triangle. RULE A. — Multiply the length of any one of the sides by one-half of its perpendicular...

## A manual of commerce

William Waterston - 1884 - 298 pages
...the square of 3 being 9, we have 9 X 3.1416 - 28-2744 square miles. 10. Area of a trapezoid: Multiply the sum of the two parallel sides by the perpendicular distance between them, and take half the product. Ex. The parallel sides are 4.32 feet and 5.48 feet, and the perpendicular...

## The Practical Teacher, Volume 4

Education - 1885 - 630 pages
...Mensuration. Answer one Question. I. State and prove the rule for finding the area of a trapezoid. Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the product will give the area. sides. The area of ABCDs=\$ AB and CD x perpendicular distance BG...

## Caldwell's Practical Arithmetic ...

M. P. Caldwell - Arithmetic - 1883 - 198 pages
...garden whose area is J an acre; it is 110 yards long; how wide is it? Ans. 22 yds. PROPOSITION 5.— 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. Or, place the altitude and half the sum...

## The Architect's and Builder's Pocket-book

Frank Eugene Kidder - Architecture - 1886 - 640 pages
...(ce + i 2 FJ. '9-27 = area (Fig. 27). To Jind the area of a trrtpezoicl (Fig. 28). HULK. — Multiply the sum of the two parallel sides by the perpendicular distance between them, anil divide the product by 2. To compute the area of an irregular polygon. RULE. — Divide the polygon...