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.
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The base angles of an isosceles trapezoid are congruent
A trapezoid may have no right angles, or it may have two adjacent ones.
If the height of the trapezoid is 9 and the base is 26, then it appears likely to us that the base is 26.
The perimeter of a trapezoid is the sum of its bases and legs. The area of a trapezoid is the height times (base 1 + base 2) divided by 2