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The area of a trapezoid is equal to one-half the sum of its bases multiplied by its altitude.
The So-called Peters-Hilprecht Controversy: Part I. Proceedings of the ... - الصفحة 346
بواسطة John Punnett Peters - 1908 - عدد الصفحات: 357
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## The Normal Elementary Geometry: Embracing a Brief Treatise on Mensuration ...

Edward Brooks - 1868 - عدد الصفحات: 275
...having equal altitudes are as their bases j having equal bases, they are as their altitudes. THEOREM IV. The area of a trapezoid is equal to one-half the sum of the parallel sides multiplied by the altitude. For, draw the diagonal AC, dividing the trapezoid into...
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## The Complete Arithmetic: Combining Oral and Written Exercises in a Natural ...

Albert Newton Raub - 1877 - عدد الصفحات: 333
...by Geometry : 1. The area of any parallelogram is equal to the product of its base and altitude. 2. The area of a trapezoid is equal to one-half the sum of its parallel sides, multiplied by its altitude. 1. What is the area of a room 15 ft. long, 9 ft. 6 in....
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## Elements of Plane and Solid Geometry

George Albert Wentworth - 1877 - عدد الصفحات: 398
...triangles are to each other as the product of their bases by their altitudes. PROPOSITION VI. THEOREM. 327. The area of a trapezoid is equal to one-half the sum of the parallel sides multiplied by the altitude. NEC AFB Let ABC H be a trapezoid, and EF the altitude....
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## Elements of Geometry

George Albert Wentworth - 1879 - عدد الصفحات: 250
...triangles are to each other as the product of their bases by their altitudes. PROPOSITION VI. THEOREM. 327. The area of a trapezoid is equal to one-half the sum of the parallel sides multiplied by the altitude. HEC AFB Let ABC H be a trapezoid, and EF the altitude....
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## Texas School Journal, المجلد 8

1890
...angle formed by a tangt-nt and a chord is measured by one-half of the intercepted arc. :¡. J'l-nre: The area of a trapezoid is equal to one-half the sum of the parallel sides multiplied by the altitude. 4. Find the area of a circle inscribed in a square containing...
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## The Elements of Geometry

Webster Wells - 1886 - عدد الصفحات: 371
...areas of the trapezoids Ab, Be, etc., whose common altitude is Hh, the slant height of the frustum. But the area of a trapezoid is equal to one-half the sum of its parallel sides multiplied by its altitude (§ 331). PROPOSITION XIX. THEOREM. 564. A triangular pyramid...
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Webster Wells - 1893 - عدد الصفحات: 339
...product of its base and altitude. 3. The area of a square is equal to the square of one of its sides. 4. The area of a trapezoid is equal to one-half the sum of its bases, multiplied by its altitude. It is important to observe that, in finding the product of two lines, such as the base and altitude...
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Webster Wells - 1893 - عدد الصفحات: 339
...product of its base and altitude. 3. The area of a square is equal to the square of one of its sides. 4. The area of a trapezoid is equal to one-half the sum of bases, multiplied by its altitude. is important to observe that, in finding the product of wo lines,...
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## The Elements of Solid Geometry

William C. Bartol - 1893 - عدد الصفحات: 95
...their bases; any two triangles are to each other as the product of their bases by their altitudes. 366. The area of a trapezoid is equal to one-half the sum of the parallel sides multiplied by the altitude. 367. I. A circle may be circumscribed about a regular...
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## Bulletin of the American Mathematical Society, المجلد 13

1906
...rectangle is equal to the product of its base and altitude. 2. The area of a square is equal to the square of its side. 3. The area of a right triangle...trapezoid is equal to one-half the sum of its bases multipled by its altitude." He also shows that they must have known either how to find the volume of...
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