| James Thompson - Arithmetic - 1808 - 176 pages
...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... | |
| Matthew Iley - 1820 - 512 pages
...an Inch in Depth, of a Quadrilateral having two Parallel unequal Sides. RULE. By the Pen. Multiply **half the sum of the parallel sides by the perpendicular distance between them,** and divide the product by the number of cubic inches in the proposed integer. By the Sliding Rule.... | |
| Anthony Nesbit - Surveying - 1824 - 476 pages
...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... | |
| William Galbraith - Astronomy - 1827 - 412 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.** 5. Irregular Polygon. — Divide it into triangles, find their areas, the sum of these will be the... | |
| Thomas Hornby (land surveyor.) - Surveying - 1827 - 318 pages
...00000000 2.40000 40 16.00000 Ans. 0A. 2n. 16p. PROBLEM 3. 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. EXAMPLE. Required the area of the trapezoid AB CD, whose parallel... | |
| John Bonnycastle - Geometry - 1829 - 256 pages
...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... | |
| Edinburgh encyclopaedia - 1830 - 856 pages
...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... | |
| Robert Simson (master of Colebrooke house acad, Islington.) - 1838 - 206 pages
...^ 16s + 122 = 20, the length of the hypotenuse. HoW do you find the area of a trapezoid ? Multiply **half the sum of the parallel sides by the perpendicular distance between them,** and the product will be the area of the trapezoid. What is the area of a trapezoid, its parallel sides... | |
| Charles Davies - Geometrical drawing - 1840 - 262 pages
...the breadth of the Ans. 77,8875 feet. PROBLEM VI. 13. To find the area of a trapezoid. RULE. Multiply **the sum of the parallel sides by the perpendicular distance between them,** and then divide the product by two : — the quotient will be the area. EXAMPLES. DC 1. Required the... | |
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