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 Βιβλία Βιβλία To find the area of a trapezium. RULE. — Divide the trapezium into two triangles by a diagonal, and then find the areas of these triangles ; their sum will be the area of the trapezium. Arithmetic, for use in schools - Σελίδα 144
των John Barter (of the science and art coll, Plymouth.) - 1877
Πλήρης προβολή - Σχετικά με αυτό το βιβλίο ## The shipwright's vade-mecum [by D. Steel].

David Steel - 1805
...and three-eighths of an inch, place the comJJ / 2 ,?4 1 G rn i ' i , 1 __ i .- \\ i3 -H ' PROBLEM 5. To find the Area of a Trapezium. RULE. Divide the trapezium into two triangles by a diagonal ; then find the areas of these triangles, by Problem 3, and add them together... ## The complete measurer: or, The whole art of measuring, containing the ...

Thomas Keith - 1817
...feet, and the length of a ladder to reach the second flooc window must be 3T5753 feet. PROBLEM VII. To find the Area of a Trapezium. RULE*. Divide the trapezium into two triangles by a diagonal drawn from two of its opposite angles; then find the areas of these triangles,... ## A treatise on practical geometry, mensuration, conic sections, gauging, and ...

...on the 30 foot wall ? Ans. 31-9956 height of waif, and 15-484 the breadth of the house. PROBLEM XL To find the area of a Trapezium. RULE. Divide the trapezium into two triangles, by joining two of its opposite angles ; find the area of each triangle ; and the sum... ## A Treatise on Mensuration for the Use of Schools

1837 - 262 σελίδες
...the prop 37-68 feet. PROBLEM XI. To fotd the area of a Trapezium. RULE. Divide the trapezium into two triangles, by joining two of its opposite angles ;...area of each triangle, and the sum of both areas will give the area of the trapezium. Or: Draw two perpendiculars from the opposite angles to the diagonal... ## A Treatise on Mensuration for the Use of Schools

Commissioners of National Education in Ireland - 1837 - 262 σελίδες
...greater segment 9*2 186 feet, lesser segment 6-40 18 feet, and length of the prop 37-68 feet. PROBLEM XI. To find the area of a Trapezium. RULE. Divide the trapezium into two triangles, by joining two of its opposite angles ; find the area of each triangle, and the sum... ## Introduction to lineal drawing and mensuration

Henry Pickton - 1847 - 48 σελίδες
...required the area of one side. ft. in. Here 80 0 10 5 800 0 33 4 833 4 Ans. 833 feet, 4 inches. Prob. XII. To find the area of a trapezium. Rule. Divide the trapezium into two triangles, find the area of these by Prob. VII., the sum of which is the required area. Prob. XIII.... ## The American Arithmetic

...longest side being 18 feet, its parallel side 16 feet, and its altitude or width 15 feet? Art. 198. To FIND THE AREA OF A TRAPEZIUM. RULE. Divide the trapezium into two triangles by a diagonal line; find the area of each of these triangles ; the sum of their areas... ## Scribner's Engineers' and Mechanics' Companion: Comprising United States ...

J. M. Scribner - 1849 - 264 σελίδες
...base, ab ? 53 -45" = 784, and ^^783=28 yds. Ans. 28 yds. OF TRAPEZIUMS AND TRAPEZOIDS. PROBLEM III. To find the Area of a Trapezium. Rule. — Divide the trapezium into triangles by drawing diagonals ; and the sum of the areas of these triangles will be the area of the trapezium.... ## Introduction to The National Arithmetic: On the Inductive System Combining ...

Benjamin Greenleaf - 1849 - 324 σελίδες
...parallel. A diagonal is a line joining any two -opposite angles of a quadrilateral; as, E F. ART. 331. To find the area of a trapezium. RULE. — Divide the trapezium into two triangles by a diagonal, and tlifn find the areas of these triangles ; their sum will be the area... ## Introduction to the National Arithmetic ...

Benjamin Greenleaf - 1851
...parallel. A diagonal is a line joining any two opposite angles of a quadrilateral; as, E F. ART. 331. To find the area of a trapezium. RULE. — Divide the trapezium into two triangles by a diagonal, and then find the areas of these triangles ; their sum will be the area...