Books Books 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. A System of Geometry and Trigonometry: Together with a Treatise on Surveying ... - Page 33
by Abel Flint - 1804 - 168 pages ## An Elementary Arithmetic Designed for Academies and Schools: Also Serving as ...

George Roberts Perkins - Arithmetic - 1851 - 356 pages
...the area of the trapezoid, which is the sum oi the two-triangles, may be found by the following E—- RULE. Multiply half the sum of the two parallel sides by the altitude. This rule has a fine application in measuring a tapering board, as A BCD. In this case half... ## The Computist's Manual of Facts: And Merchant's and Mechanic's Calculator ...

Ezra S. Winslow - Business mathematics - 1853 - 264 pages
...83| rods. Ans. ' OF TRAPEZOIDS AND TRAPEZIUMS. To find the area of a trapezoid. RULE. — Multiply the sum of the two parallel sides by the perpendicular distance between them, and divide the product by 2 ; the quotient is the area. EXAMPLE. — The side AB, of the trapezoid... ## Indroduction to the National Arithmetic ...

Benjamin Greenleaf - 1854 - 340 pages
...318. A TRAPEZOID is a quadrilateral, which has only one pair of its opposite sides parallel. ART. 319. 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. 1. What is the area of a trapezoid, the... ## The Practical Surveyor's Guide: Containing the Necessary Information to Make ...

Andrew Duncan (Surveyor) - Surveying - 1854 - 156 pages
...between B and C. Fences from F, G, and A, to P, trisect the farm, which is plain from the figure. 15th. To find the area of a Trapezoid Rule, multiply half the sum of the parallel sides by the perpendicular distance between them, and the product is the area. Let figure... ## Cyclopedia of Architecture: Historical, Descriptive, Typographical ...

Robert Stuart - Architecture - 1854 - 1272 pages
...when the square of 189 AB has been subtracted. 189 Prob. 4. To find the area of a trapezoid. Multiply the sum of the two parallel sides by the perpendicular distance between them, and half the product will be the area. Ex. In a trapezoid, the parallel sides are AB 7, and CD 12,... ## Elements of Plane and Spherical Trigonometry: With Their Applications to ...

Elias Loomis - Trigonometry - 1855 - 192 pages
...to one fourth the square of one of its sides multiplied by the square root of 3. PROBLEM III. (87.) To find the area of a trapezoid. RULE. Multiply half the sum of the parallel sides into their perpendicular distance. For demonstration, see Geometry, Prop. 7, B. IV.... ## An Elementary Arithmetic Designed for Academies and Schools: Also Serving as ...

George Roberts Perkins - Arithmetic - 1855 - 382 pages
...Hence the area of the trapezoid, which is the sum of th« two-triangles, may be found by the following RULE. Multiply half the sum of the two parallel sides by the altitude. This rule has a fine application in measuring a tapering board, as ABCD. In this case half... ## A New System of Arithmetic, on an Improved Plan, Embracing the Rules of ...

Charles Guilford Burnham - 1857 - 336 pages
...three sides of a triangle are 6, 8, and 10 chains, What is the area ? Ans. 24 chains. Art. 271 . — To find the area of a trapezoid. RULE. Multiply half...parallel sides by the perpendicular distance between them : the product will be ilie area. 1. What is the area of a piece of land that is 30 chains long, 20... ## Burnham's Arithmetic, Revised: A New System of Arithmetic, on an Improved ...

Charles Guilford Burnham - Arithmetic - 1857 - 328 pages
...three sides of a triangle are 6, 8, and 10 chains. What is the area ? Ans. 24 chains. Art. 271. — To find the area of a trapezoid. RULE. Multiply half...sides "by the perpendicular distance between them : the product will be the area. 1. What is the area of a piece of land that is 30 chains long, 20 chains... 