 | William Frothingham Bradbury - Plane trigonometry - 1864 - 324 pages
...2)6.146128 3.073064 Ans. 1183.2 square feet. PROBLEM III. 106. To find the area of a trapezoid. RULE I. Multiply half the sum of the parallel sides by the perpendicular distance between them. Or, if the angles are known, we can use RULE II. Divide the trapezoid by a diagonal, and find the area... | |
 | William Mitchell Gillespie - Surveying - 1868 - 530 pages
...figures, tiro opposite sides of which are parallel. The content of a Trapezoid equals half the product of the sum of the parallel sides by the perpendicular distance between them. If the given quantities are the four sides a, 5, c, d, of which 5 and d are parallel ; then, making... | |
 | William Mitchell Gillespie - Surveying - 1869 - 550 pages
...figuies, U'o opposite sides of which are parallel. The content of a Trapezoid equals half the product of the sum of the parallel sides by the perpendicular distance between them. If the given quantities are the four sides a, b, c, d, of which b and d are parallel ; then, making... | |
 | Alfred Hiley - 1871 - 184 pages
...of the parallel sides by the perpendicular distance between them, and divide the product by 2. Or, multiply half the sum of the parallel sides by the perpendicular distance between them. Note 1. — To find the sum of the parallel sides, when the area and the perpendicular distance are... | |
 | William Frothingham Bradbury - Geometry - 1872 - 262 pages
...20 " 1.301030 2)6.146128 3.073064 Ans. 1183.2 sq. fI. 143. To find the area of a trapezoid. RULE I. Multiply half the sum of the parallel sides by the perpendicular distance between them. 144. If the angles are known, we can use RULE II. Divide the trapezoid by a diagonal, and find the... | |
 | Shelton Palmer Sanford - Arithmetic - 1872 - 404 pages
...whose sides are 56, 72 and 84 feet ? Ant. 221.23 sq. yd. ART. 361. To FIND THE AREA OF A TRAPEZOID. Multiply half the sum of the parallel sides by the perpendicular distance between them. 1. The parallel sides of a trapezoid are 36 and 24 feet, and its breadth 16 feet ; what is the area... | |
 | Henry Lewis (M.A.) - Measurement - 1875 - 104 pages
...trapezoid is a four-sided figure having two opposite sides parallel. To find the area of a trapezoid multiply half the sum of the parallel sides by the perpendicular distance between them. The reasonableness of this rule may be demonstrated without any strictly mathematical investigation,... | |
 | Daniel Kinnear Clark - Engineering - 1878 - 1022 pages
...of two contiguous sides by the natural sine of the included angle. To find the area of a trapczoid. Multiply half the sum of the parallel sides by the perpendicular distance between them. To find the area of a quadrilateral inscribed in a circle. From half the ;um of the four sides subtract... | |
 | Thomas Hunter - Geometry, Plane - 1878 - 142 pages
...it 28 and 33J feet. Ans. 222^ yards. PROBLEM VT. To find the area of a trapezoid. RULE.—Multiply the sum of the parallel sides by the perpendicular distance between them, and half the product will be the area.* 1. The parallel sides of a trapezoid are 750 and 1225, and the... | |
 | Surveying - 1878 - 534 pages
...tivo opposite sides of which are parallel. The content of a Trapezoid equals half the • product of the sum of the parallel sides by the perpendicular distance between them. If the given quantities are the four sides a, b, c, d, of which 5 and d are parallel; then, making... | |
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Multiply the sum of the parallel sides by the perpendicular distance between them, and half the product will be the area. 
