Answer:
BAE + ECB + ABC = 180 [ BEING INTERIOR TRIANGLE ANGLES SUM ]
180 = Angle ABC + BAE + ECB
180 = Angle ABC + 27 + 21
Angle ABC = 180 -27 -21
Angle ABC = 132
Angle ABC = Angle ADC (opposite angles of a parallelogram are equal).
Angle = 132
Step-by-step explanation:
