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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.
A System of Geometry and Trigonometry: Together with a Treatise on Surveying ... - Page 33
by Abel Flint - 1804 - 168 pages

## For sixth, seventh, and eighth grades

George Edward Atwood - Arithmetic - 1894 - 396 pages
...separately, find the product of the half sum and the three remainders, and extract its square root. 431. To find the area of a trapezoid. RULE. — Multiply half the sum of the, parallel sides by the altitude. 432. To find the area of a trapezium. RULE. — Multiply the diagonal...

## Mining: A Journal Devoted to the Interests of Mines and Mining ..., Volume 2

Mines and mineral resources - 1894 - 330 pages
...as in previous problem. Fig. 49. PROB. V 1 1 . — To find the area of a trapezoid. Multiply half of the sum of the two parallel sides by the perpendicular distance between them, and p .c the product will be the / \ area. / \ \ Example. — Let ABCD (Fig. 49) be a trapezoid. The...

## Colliery Surveying: A Primer Designed for the Use of Students and Colliery ...

Thomas Aloysius O'Donahue - Mine surveying - 1896 - 184 pages
...multiply the base by half the perpendicular. PROB. VII. To find the area of a trapezoid. Multiply half of the sum of the two parallel sides by the perpendicular distance between them, and the product will be the area. Let ABCD (Fig. 61) be a trapezoid. The side EC = 40, Fio. 61. Pra....

## Manual of Military Field Engineering for the Use of Officers and Troops of ...

William Dorrance Beach - Military field engineering - 1897 - 302 pages
...the area of a rectangle. Multiply the base by the height. To find the area of a trapezoid. Multiply the sum of the two parallel sides by the perpendicular distance between them and take half the product. To find the area of a triangle. Multiply the base by the altitude and take...

## Longmans' School Mensuration: With an Additional Chapter and Exercises

Alfred John Pearce - 1897 - 202 pages
...of which is 1 yd. 10. June, 1890.— Prove that the area of a trapezoid is one-half the. product of the sum of the two parallel sides by the perpendicular distance between them. The area of a trapezoidal field is 4J ac. ; the perpendicular distance between the parallel sides is...

## Manual of Military Field Engineering for the Use of Officers and Troops of ...

...in line with CO. Measure FK. This is the required distance. To und thc area of a trapezoid. Multiply the sum of the two parallel sides by the perpendicular distance between them and take half the product. To find the area of a triangle. Multiply the base by the altitude and take...

## Key to Engines and Engine-running: A Practical Treatise Upon the Management ...

Joshua Rose - Engines - 1899 - 478 pages
...in Fig. 94. Its altitude or height is the distance between its paralell sides, as E in the figures. To find the area of a trapezoid. Rule. Multiply half the sum of the two paralell sides by the altitude. H 0 D Fig. 94. In an ellipse the line A, Fig. 95, represents the "major,"...

## For 6th-8th grade

George Edward Atwood - Arithmetic - 1899 - 392 pages
...separately, find the product of the half sum and the three remainders, and extract its square root. 431. To find the area of a trapezoid. RULE. — Multiply half the sum of the parallel sides by the altitude. 432. To find the area of a trapezium. RULE. — Multiply the diagonal...