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" 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. "
The New American Arithmetic - Page 113
by Samuel Mecutchen, George Mornton Sayre - 1877
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A System of Geometry and Trigonometry: Together with a Treatise on Surveying ...

Abel Flint - Surveying - 1804 - 226 pages
...Angle 28° 5'. 0.47076 105X85=8925, and 8925X0.47076=4201 the double Area of the Triangle. PROBLEM X. To find the Area of a Trapezoid. RULE. Multiply half the Sum of the two parallel Sides by the perpendicular distance between them, or the Sum of the two parallel Sides...
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A System of Geometry and Trigonometry: Together with a Treatise on Surveying ...

Abel Flint - Surveying - 1808 - 190 pages
...28* 5'. 0.47076 105x85=8925, and 8925x0.47076=4201 the double Area of the Triangle. • PROBLEM X. To find the Area of a Trapezoid. RULE. Multiply half the Sum of the two parallel Sides by the perpendicular distance between them, or the sum of the two parallel Sides...
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The complete measurer: or, The whole art of measuring, containing the ...

Thomas Keith - 1817 - 306 pages
...trapezium 85342'2885 yards, or 17•6327 acres; or 17 acres. <• 2 roods 21 perches. PROBLEM VIII. • To find the Area of a Trapezoid. RULE *. Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the product will be the area. Example...
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A New and Easy Introduction to the Mathematics: Containing. A system of ...

Ira Wanzer - Arithmetic - 1831 - 408 pages
...many acres are contained in a triangle whose sides are 30, 40, and 50 rods? Ans. 3f A. PROBLEM V, — To find the area of a Trapezoid. RULE. — Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the pr«' duct will be the area....
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A treatise on practical geometry, mensuration, conic sections, gauging, and ...

Ireland commissioners of nat. educ - 1834 - 370 pages
...as follows, viz. AB 25, AD 34, D С 35, and B С 16 ; required its area ? Ans. 700-99. PROBLEM XIII. To find the area of a Trapezoid RULE. Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the product will give the area.*...
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A Treatise on Mensuration for the Use of Schools

Commissioners of National Education in Ireland - Measurement - 1837 - 284 pages
...are as follows, viz. AB 25, AD 34, DC 35, and BC 16 ; required its area. Am. 700.99. PROBLEM XIII. To find the area of a Trapezoid. RULE. Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the product will give the area.*...
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A New System of Arithmetic, on the Cancelling Plan: Embracing the Rules of ...

Charles Guilford Burnham - Arithmetic - 1841 - 324 pages
...The three sides of a triangle are 6, 8 and 10 chains. What is the area ? Answer, 24 chains. To fold the area of a trapezoid. RULE. Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the product will be the area. 1....
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A Treatise on Surveying and Civil Engineering, Wherein Everything that is ...

P. O'Shaughnessy (Civil engineer) - Civil engineering - 1848 - 110 pages
...of a triangle, having the base 82 chains and the altitude 20. 12 chains. Ans. 82a lr 3|P. Prob. 3. To find the area of a trapezoid. Rule — Multiply half the sum of the two perpendiculars by the base, and the product will be area. (The truth of this rule is manifest,...
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Introduction to The National Arithmetic: On the Inductive System Combining ...

Benjamin Greenleaf - Arithmetic - 1849 - 336 pages
...318. ATRAPEZOID 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 longer parallel side QUESTIONS....
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Introduction to The National Arithmetic: On the Inductive System Combining ...

Benjamin Greenleaf - Arithmetic - 1850 - 346 pages
...318. ATBAPEZOID 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 parcdlel sides by the altitude, and the product is the area. 1. What is the area of a trapezoid, the...
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