| James Thompson - Arithmetic - 1808 - 176 pages
...IV. To find the area of a trafiezoid, or quadrangle, <u'o cf •whose opposite sides are parallel. **RULE — Multiply the sum of the parallel sides by the perpendicular distance between them, and** half the product •will be the area. EXAMPLES. 13. Required the area of a trapezoid whose parallel... | |
| Peter Nicholson - 1809 - 426 pages
...BF. 14 X36 84 42 504=the area of ABCD. PROBLEM VI. To find the area of a trapezoid. Multiply the half **sum of the parallel sides by the perpendicular distance between them, and** the product will be the area. EXAMPLE I. What is fhe area of a board or plank in the form of a trapeziod,... | |
| Matthew Iley - 1820 - 512 pages
...Area of a Quadrilateral wherein two unequal Sides are Parallel to one another. RULE. Multiply half **the sum of the parallel sides by the perpendicular distance between them, and** the product will be the area. Let ABCD be a quadrilateral, wherein AC and BD are parallel but unequal;... | |
| Anthony Nesbit - Surveying - 1824 - 476 pages
...37| feet ; what is its area ? Ans. 1131^.2 in. 9 pa. PROBLEM VIII. To find the area of a Irapezoid. **RULE. Multiply the sum of the parallel sides by the perpendicular distance between them, and** half the product will be the area. Or, half the sum of the sides multiplied by their distance will... | |
| Peter Nicholson - Mathematics - 1825 - 1046 pages
...42 501 = the arca of ABCD. MENSURATION. Prob. 6. To find the area of a trapezoid. Multiply the half **sum of the parallel sides by the perpendicular distance between them, and** the product will be the area. Ex. 3. What is the area of a board or plank in the form of a trapezoid,... | |
| Thomas Hornby (land surveyor.) - Surveying - 1827 - 318 pages
...3600000000 (.60000 36 • • • • 4 • • 00000000 2.40000 40 16.00000 Ans. 0A. 2n. 16p. PROBLEM 3. **To find the Area of a Trapezoid. RULE. Multiply the...sides by the perpendicular distance between them, and** half the product will be the area. EXAMPLE. Required the area of the trapezoid AB CD, whose parallel... | |
| John Gummere - Surveying - 1828 - 404 pages
...80 ch. and the third, N. 25J E. dist. 12.92 ch. : what is the area? Ans. 21 A. 3 R. 2 P. PROBLEM IX. **To find the area of a trapezoid. RULE. Multiply the sum of the parallel sides by** their perpendicular distance, and half the product will be the area.* EXAMPLES. 1. Required the area... | |
| John Bonnycastle - Geometry - 1829 - 256 pages
...PROBLEM VI. To find the area of a trapezoid, or a quadrangle, two of whose opposite sides are parallel. **RULE.* Multiply the sum of the parallel sides by the perpendicular distance between them, and** half the product will be the EXAMPLES. 1. Required the area of the trapezoid ABCD, whose sides AB and... | |
| Edinburgh encyclopaedia - 1830 - 856 pages
...trapezoid. Note. A trapezoid is a quadrilateral, of which two opposite sides are parallel but not equal. **RULE. Multiply the sum of the parallel sides by the perpendicular distance between them, and** half the product is the area. In the trapezoid ABCD, draw the diagonal AC, and from its extremities... | |
| William Galbraith - Astronomy - 1834 - 454 pages
...Trapezium. — Multiply the base into half the sum of the perpendiculars. 4. Trapezoid. — Multiply half **the sum of the parallel sides by the perpendicular distance between them.** fi. Irregular Polygon. — Divide it into triangles, find their areas, the sum of these will be the... | |
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