6 B A NOT TO 75° SCALE 80° C E D ABCD is a quadrilateral. E lies on CD and AE is parallel to BC. EA = ED. Find (a) angle ABC Angle ABC = ................................................ [1] (b) angle AED Angle AED = ................................................ [1] (c) angle DAB. Angle DAB = ................................................ [2] M SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TO