 | Samuel Mecutchen, George Mornton Sayre - Arithmetic - 1877 - 200 pages
...5. The base of a rhomboid is 375 ft. 6 in., and the perpendicular height 40 yards; what is its area? To find the area of a trapezoid. RULE. Multiply half the sum of the parallel sides by the altitude. 1. What is the number of square feet in a trapezoid, one of the parallel... | |
 | Moffatt and Paige - 1879 - 506 pages
...Trapezoid. A trapezoid is a quadrilateral figure having two only of its sides parallel. Rule. — Multiply the sum of the two parallel sides by the perpendicular distance between them, and take half the product for the. area. C __ A D f - E --- B Proof. — Let ACDB be a trapezoid, having... | |
 | Joseph Ray - Arithmetic - 1880 - 420 pages
...II. To find the area of a triangle. Rule.— Take half the product of the base by the altitude. III. To find the area of a trapezoid. Rule. — Multiply half the sum of the parallel sides by the altitude. NOTE. — The following is demonstrated in Geometry : IV. To find the... | |
 | William Paterson (Lieut.-Col.) - Military topography - 1882 - 206 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... | |
 | 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... | |
 | William Dodds - 1883 - 198 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...distance between them, and the product will be the area. If two straight "iT lines are of unequal ! / length, the average or mean length of the two is found... | |
 | William John Macquorn Rankine - 1883 - 454 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... | |
 | William Waterston - 1884 - 314 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 2.18... | |
 | 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...perpendicular distance between them, and the product will give the area. sides. The area of ABCDs=$ AB and CD x perpendicular distance BG between them. H Bisect... | |
 | 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... | |
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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. 
