| Benjamin Greenleaf - 1854 - 342 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 then find the areas of these triangles.; their sum will be the area... | |
| Henry James Castle - 1856 - 220 σελίδες
...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... | |
| Benjamin Greenleaf - 1857 - 336 σελίδες
...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... | |
| Benjamin Greenleaf - 1861 - 338 σελίδες
...parallel. A diagonal is a line joining any two opposite angles of a quadrilateral; as K F. ART. 335. To find the area of a trapezium. RULE. — Divide the trapezium into two triangles by a diagonal, and hen find the areas of these triangles; their sum will be the area... | |
| John Fair Stoddard - 1868 - 356 σελίδες
...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... | |
| 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... | |
| 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... | |
| Benjamin Greenleaf - 1871 - 350 σελίδες
...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... | |
| 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... | |
| 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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