Question

5. In each of the following figures, AB // CD.
Find the value of the unknown.
plz ans of this question ​

Answer 1

Answer:

ANS IS 140°

EXPLANATION :-

draw a line EF // AB and CD

FEC+DCE= 180° ( co- interor Angles on same side)

FEC=180-DCE= 180-128°

FEC=52°

FEA=AEC-FEC = 40°

hence, FEA + a=180° ( co- interor Angles on same side)

a= 180-40°= 140°

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