In a quadrilateral ABCD, angle A + angle D = 180º. Does this mean AB || DC Why? What
special name does this quadrilateral have?
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Angle A+Angle D=180°
sum of co-interior angles is 180°
AB||CD because two sides of trapezium are parallel and it has co-interior angles.
It is a trapezium in which two angles on the same side of a transversal.
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