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" 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. "
Mensuration for beginners [With] Answers - Página 45
por William Dodds - 1883
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A System of Geometry and Trigonometry: Together with a Treatise on Surveying ...

Abel Flint - 1804 - 226 páginas
...Trapezium, or irregular Four Sided Figure. RULE. Draw a Diagonal between two opposite Angles, which will divide the Trapezium into two Triangles. Find the Area of each Triangle and add them together. Or, multiply the Diagonal by half the Sum of the two Perpendiculars let fall upon...
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The shipwright's vade-mecum [by D. Steel].

David Steel - 1805 - 392 páginas
...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 sum...
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A System of Geometry and Trigonometry: Together with a Treatise on Surveying ...

Abel Flint - 1808 - 190 páginas
...Trapezium^ or irregular Four Sided Figure. RULE. Draw a Diagonal between two opposite Angles, which will divide the Trapezium into two Triangles. Find the Area of each Triangle and add them together. Or, multiply the Diagonal by half the Sum of the two Perpendiculars let fall upon...
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The complete measurer: or, The whole art of measuring, containing the ...

Thomas Keith - 1817 - 306 páginas
...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, and add...
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A System of Geometry and Trigonometry: Together with a Treatise on Surveying ...

Abel Flint - 1825 - 252 páginas
...T'apezium, or trregular Four Sided Figure. RULE. Draw a Diagonal between two opposite Angles, which will divide the Trapezium into two Triangles. Find the Area of each Triangle and add them together. Or, multiply the Diagonal by half the Sum of the two perpendiculars let fall upon...
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A treatise on practical geometry, mensuration, conic sections, gauging, and ...

Ireland commissioners of nat. educ - 1834 - 370 páginas
...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 of both areas...
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A System of Geometry and Trigonometry: With a Treatise on Surveying; in ...

Abel Flint - 1835 - 366 páginas
...trapezium, or irregular four sided figure. RULE. Draw a diagonal between two opposite angles, which will divide the trapezium into two triangles. Find the area of each triangle and add them together. Or, multiply the diagonal by half the sum of the two perpendiculars let fall upon...
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A Treatise on Mensuration for the Use of Schools

Commissioners of National Education in Ireland - 1837 - 290 páginas
...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 of both areas will...
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A Treatise on Mensuration for the Use of Schools

Commissioners of National Education in Ireland - 1837 - 284 páginas
...9-2 1 86 feet, lesser segment 6-40 1 8 feet, and length of 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 ; find the area of each triangle, and the sum of both areas will...
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Introduction to lineal drawing and mensuration

Henry Pickton - 1847 - 84 páginas
...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. To find the area of a trapezoid....
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