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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. "
Arithmetic, for use in schools - Σελίδα 144
των John Barter (of the science and art coll, Plymouth.) - 1877
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Indroduction to the National Arithmetic ...

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...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...

Elementary text book for young surveyors and levellers

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...same sides, but with an angle of 105 degrees, what is the area? AH p. Ansirer 31. 0. 31. PROBLEM VL To find the area of a trapezium. Rule. Divide the trapezium into two triangles by the longest diagonal (see Geometrical Problems, 13th Ex.); take this as the common...

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...parallel. A diagonal is a line joining any two opposite angles of a quadrilateral ; as E F. ART. 335. To find the area of a trapezium. RULE. — Divide the trapezium into two trianyles by a diagonal, and then find the areas of these triangles; their sum will be the area...

Introduction to the National Arithmetic, on the Inductive System: Combining ...

Benjamin Greenleaf - 1861 - 338 σελίδες
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Practical Arithmetic, Embracing the Science of Numbers and the Art of ...

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...TBAPKZIUK. 491, A Trapes him is a quadrilateral, Bone of whose sides are parallel. Trapezium. 402* To find the area of a trapezium, Rule. — Divide the trapezium into two triangles ly a diag* end ; find the area of each triangle by Rule (4:58), and the sum of these...

The advanced lesson book, by E.T. Stevens and C. Hole

Edward Thomas Stevens - 1866 - 434 σελίδες
...B s perpendiculars to it. To Jind 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. THE TRAPEZOID. Definition : — A trapezoid is a four-sided figure...

The Boilermaker's & Iron Shipbuilder's Companion ...

James Foden - 1869 - 258 σελίδες
...and B С, multiply their sum by the distance between them — BE, and half the product is the area. To find the area of a Trapezium. RULE. — Divide the trapezium into two triangles by the diagona1 line AC, and let two perpendiculars, BF and DE, fall on the diagonal...

Introduction to the National Arithmetic on the Inductive System: Combining ...

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...straight line which joins the vertices of any two opposite angles of a quadrilateral ; as E F. 335. 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...

The Acting Teacher's and Student's in Training Guide and Text Book for ...

Henry Major - 1873 - 580 σελίδες
...13. What is the area of a field, the sides being 24, '. 18 feet? Ans. 104'5. y * ' PROBLEM IV. — To find the area of a trapezium,. RULE. — Divide the trapezium into two triangles by a diagonal; find the area of each of these by the foregoing rule. If the figure consint...

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Samuel Mecutchen, George Mornton Sayre - 1877 - 200 σελίδες
...is the area of a trapezoid whose parallel sides are 20 yards and 16^- feet, and altitude 15 inches? To find the area of a trapezium. RULE. Divide the trapezium into two triangles by a diagonal line; the sum of the areas of these triangles will be the area of the trapezium....




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