A complete and practical solution book for the common school teacher (1899)
Fairchild, J[ohn] T[heodore] [from old catalog] · Crawfis College, Ohio, The author · leaf 235
(3) Area of ABCD = l(DC-r-AB) X CE = 160 sq. rd., or 1 A. fig. 109. Rule.—Multiply half the sum of the parallel sides by the altitude.PROBLEM 438. Area of a trapezoid is 400, one of the parallel sides is 24, and thewidth 20: find the other side. Solution. (1) Let ABCD represent the trapezoid. (2)… … MENSURA TION 221 PROBLEM 439.The parallel sides of a trapezoid are 36 and 24, and the other twosides are each 10: find the width. Solution. (1) Let ABCD represent the trapezoid. (2) DC=24, AB=36, CB=AD=10. (3) AS = EB=(36—24)^-2=6. (4) Now, CEB is a right triangle. (5) EC=VCB2—EBa=8. .*. 8 is the…
Arithmetic · Geometry
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