Yes.
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A trapezoid.
The base angles of an isosceles trapezoid are congruent
Every Trapezoid has 4 angles.An isosceles trapezoid has 2 acute angles.?
Because its base angles are equal and the 4 interior angles of any quadrilateral add up to 360 degrees so in this case opposite angles must add up to 180 degrees
Wouldn't think so, think of a trapezium shaped like a square with a triangle on one side... The angles at one end of the figure are both 90o, and the angles at the other end will be supplementary, but not opposite angles.