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Books Books 31 - 32 of 32 on The area of a trapezoid is equal to one-half the sum of the parallel sides multiplied....
" The area of a trapezoid is equal to one-half the sum of the parallel sides multiplied by the altitude. "
Sheet Metal Drafting, Prepared in the Extension Division of the University ... - Page 23
by Ellsworth M. Longfield - 1921 - 236 pages
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Bulletin of the American Mathematical Society, Volume 13

Mathematics - 1907
...side. 3. The area of a right triangle is equal to one-half the product of its base and altitude. 4. The area of a 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...
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The West Virginia School Journal, Volume 2

Education - 1882
...from the vsrtex of the angle which ' they form to the opposite side, 12; required, the third side. 7. The area of a trapezoid is equal to one-half the sum of the parallel sides multiplied by the altitude. Demonstrate. 8. Through three points not in the same line...
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