 | Isaac Todhunter - Measurement - 1869 - 312 pages
...Thus we obtain the rule which will now be given. 161. To find the area of a trapezoid. RULE. Multiply the sum of the two parallel sides by the perpendicular distance between them, and half the product will be the area. 162. Examples : (1) The two parallel sides of a trapezoid are 2... | |
 | 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 tiiem. 5. To find the circumference of a circle, 1. Multiply the diameter by 3.1416. Or, 2. Divide... | |
 | J Alfred Skertchly - 1873 - 184 pages
...two of its sides parallel, such as OPWC, is called a trapezoid; and its area is found by multiplying half the sum of the two parallel sides by the perpendicular distance between them. Here the area of 0 PWC equals | (O P+CW) x O C. The ordinate OP denotes the initial velocity, and C... | |
 | 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... | |
 | Emerson Elbridge White - Arithmetic - 1870 - 348 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... | |
 | 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... | |
 | William John Macquorn Rankine, Edward Fisher Bamber - Mechanical engineering - 1873 - 372 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... | |
 | Mechanical engineering - 1874 - 1186 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 triangles... | |
 | 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... | |
 | 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... | |
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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. 
