The interior angles of ANY trapezium sum to 360 degrees.
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The base angles are congruent in an isosceles trapezoid
There are two pairs of congruent base angles in an isosceles trapezoid.
isosceles trapezoid
There is no figure to be seen but an isosceles trapezoid will have equal base angles.
If the trapezoid is an isosceles trapezoid, with congruent legs, then the base angles are congruent. Otherwise, no.