First identify the two lines that are parallel. Call these the top and bottom lines. Mark the two corners on the left A and B. Then angle A + angle B = 180 degrees. Next, mark the two corners on the right C and D. Angle C + angle D = 180 degrees. Hope this helps :)
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A trapezoid has four angles.
No, not all angles in a trapezoid are congruent. A trapezoid may have two pairs of congruent angles, or may have no congruent angles.
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 base angles of an isosceles trapezoid are congruent
A trapezoid has two sets of equal angles