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A regular trapezoid (!) is a square. And each interior angle of a square is 90 degrees.
Only when it is an isosceles trapezoid otherwise no.
Area of a trapezoid = 0.5*(sum of parallel bases)*height Need to know the measure of the other base
No. But they add up to 180 degrees.
A quadrilateral may have all 4 angles different if it is not a square, rectangle, rhombus, rhomboid, rectangular trapezoid, isosceles trapezoid, or parallellogram.