The bases of a trapezoid are either of its parallel sides.
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If the height of the trapezoid is 9 and the base is 26, then it appears likely to us that the base is 26.
For a parallelogram, take the base times the height. For a trapezoid, take the smaller base and times it by the height.
The base angels of a trapezoid are the angles that attach to the legs of the trapezoid. There are four base angles in a trapezoid.
the area of a trapezoid is the height times (base 1 + base 2)
The base angles of an isosceles trapezoid are congruent