Gore, James Howard, 1856-1939 · New York, Longmans, Green, and co. · leaf 119
ne-half of a paral-lelogram having the same base and altitude. EXERCISES. 1. The area of a rectangle is 6912 square inches and its base is 2 yards.What is its perimeter in feet ? 2. If the base and altitude of a triangle are 18 and 12, what is thelength of the side of an equivalent square ? 3. Show… … §260.] AREAS OF POLYGONS. 107 PROPOSITION VI. THEOREM. 258. The area of a trapezoid is equal to the product of thehalf sum of its parallel sides by its altitude.
Geometry
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