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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

## The Common School Arithmetic: Combining Analysis and Synthesis ; Adapted to ...

James Stewart Eaton - Arithmetic - 1873 - 340 pages
...upon it, from the other angles of the trapezium, 6 and 8 inches ? Ans. 140 sq. in. 389. PROBLEM 3. To find the area of a trapezoid : RULE. Multiply half the sum of the parallel sides by the altitude, and the product will be the area. 387. What it a Quadrilateral ? How...

## A Complete Arithmetic: Uniting Mental and Written Exercises in a Natural ...

Emerson Elbridge White - Arithmetic - 1870 - 350 pages
...altitude. 4. To find the area of any quadrilateral having two sides parallel, Multiply one half of the sum of the two parallel sides by the perpendicular distance between them. 5. To find the circumference of a circle, 1. Multiply the diameter by 3.1416. Or, 2. Divide the area...

## A Mechanical Text-book: Or, Introduction to the Study of Mechanics and ...

William John Macquorn Rankine, Edward Fisher Bamber - Mechanical engineering - 1873 - 368 pages
...by a pair of parallel straight lines, and a pair of straight lines not parallel). Multiply the half sum of the two parallel sides by the perpendicular distance between them. 32. Triangle. Rule A. — Multiply the length of any one of the sides by one-half of its perpendicular...

## A Mechanical Text-book: Or, Introduction to the Study of Mechanics and ...

William John Macquorn Rankine, Edward Fisher Bamber - Mechanical engineering - 1873 - 370 pages
...by a pair of parallel straight lines, and a pair of straight lines not parallel). Multiply the half sum of the two parallel sides by the perpendicular distance between them. 32. Triangle. Rule A. — Multiply the length of any one of the sides by one-half of its perpendicular...

## The High School Arithmetic: Containig All the Matter Usually Presented in a ...

Philotus Dean - Arithmetic - 1874 - 472 pages
...rd. 4. What is the area of a triangle whose sides are, respectively, 18, 20, and 24 inches? Art. 473. To find the area of a trapezoid. Rule. — Multiply half the sum of the parallel sides by the altitude. Í. How many square feet in a board 18 ft. long, 18 in. wide at one...

## Appleton's Dictionary of Machines, Mechanics, Engine-work, and ..., Volume 2

Mechanical engineering - 1874 - 1182 pages
...by 2, will be the area of the trapezium. To find the area of a trapezoid. — RULE 1. — Multiply the sum of the two parallel sides by the perpendicular distance between them, and half the product will be the area. RULE 2. — Draw a diagonal, to divide the trapezoid into two...

## Common School Arithmetic

James Stewart Eaton - Arithmetic - 1876 - 366 pages
...upon it, from the other anglea of the trapezium, 6 and 8 inches ? Ans. 140 sq. in. 389. PKOBLEM 3. To find the area of a trapezoid : RULE. Multiply half the sum of the parallel sides by the altitude, and the product will be the area. 387. What is a Quadrilateral ? How...

## The New American Arithmetic, Part 3

Samuel Mecutchen, George Mornton Sayre - Arithmetic - 1877 - 200 pages
...5. The base of a rhomboid is 375 ft. 6 in., and the perpendicular height 40 yards; what is its area? To find the area of a trapezoid. RULE. Multiply half the sum of the parallel sides by the altitude. 1. What is the number of square feet in a trapezoid, one of the parallel...