 | 1906 - 576 pages
...area may be found by the above rule for trapeziums, but generally it is calculated by the following rule: — Multiply half the sum of the two parallel...sides by the perpendicular distance between them. AREA OF THE CIRCLE. — The area of the circle may be found by any of the following three methods :... | |
 | Calvin Franklin Swingle, Frederick John Prior - Air-brakes - 1906 - 676 pages
...by the perpendicular height. Parallelogram : Area = DXH To find the area of a trapezoid— Fig. 45. Multiply half the sum of the two parallel sides by the perpendicular distance between the sides. ' (HE+D) Trapezoid: Area—- UD ») Fig. 46. To find the area of an equilateral triangle—... | |
 | Charles Westinghouse - Machine design - 1906 - 168 pages
...by the perpendicular height. Parallelogram : Area=D x H To find the area of a trapezoid— Fig. 92. Multiply half the sum of the two parallel sides by the perpendicular distance between the sides. Polygon: Area= No. of si Trapezoid: Area= (HE+D) To find the area of an equilateral triangle... | |
 | Joseph H. Rose - Sheet-metal work - 1906 - 340 pages
...by the perpendicular height. Parallelogram : Area = DXH To find the area of a trapezoid— Fig. 59. Multiply half the sum of the two parallel sides by the perpendicular distance between the sides. _ . , . (HE + D) TrapezoId : Area = ^ To find the area of an equilateral triangle — Fig.... | |
 | Alice Ravenhill - Hygiene - 1907 - 762 pages
...of a triangle. Base x perpendicular height, divide by 2. To find the area of a trapezoid. Multiply the sum of the two parallel sides by the perpendicular distance between them, divide by 2. To find the area of any rectilinear figure. Divide the figure into triangles by lines... | |
 | Frank Eugene Kidder - Architecture - 1908 - 1784 pages
...the product by 2. Or, area (Fig. 27). To find the area of a Irapezoid (Fig. 28). RULE. — Multiply the sum of the two parallel sides by the perpendicular distance between them, and divide the product by 2. To compute Ihe area of an irregular polygon. RI-LE. — Divide the polygon... | |
 | DeForest A. Preston, Edward Lawrence Stevens - Arithmetic - 1910 - 380 pages
...diameter x .7854. HaBe Width Base 146. The area of a trapezoid is found by multiplying the average length of the two parallel sides by the perpendicular distance between them, and expressing the result in square units. The average length of the two sides is ^ of their sum. 147.... | |
 | Thomas Aloysius O'Donahue - Mine surveying - 1911 - 288 pages
...the area. Let S = |(AB + BC + CA). (12) (Fig. 63) Area = VS(S - AB)(S - BC)(S - OA). Trapezoid. — Multiply half the sum of the two parallel sides by...distance between them, and the product will be the area. B (13) (Fig. 64) Area = |(AD + BC) x DE. FIG. ' B Fio. 64. If the lengths of the sides and the diagonal... | |
 | Frederick Thomas Hodgson - 1917 - 696 pages
...perpendiculars, de and bf, 18 and l(i feet? Problem IV. — To find the area of a trapezoid. Rule. — Multiply the sum of the two parallel sides by the perpendicular distance between them, and half the product will be the area. Example i. — Required the area of the trapezoid, abed, having... | |
 | Charles Lingle Woodfield - Arithmetic - 1917 - 154 pages
...Surfaces I. To find the area of a square or a rectangle: Rule.— Multiply the length by the width. IL To find the area of a trapezoid: Rule. — Multiply half the sum of the parallel sides by the altitude. III. To find the area of a triangle: Rule. — Multiply the base by... | |
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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. 
