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Step-by-step explanation:
By fig we see AB || EC
==> When Line EC is extended to X (we take it)
angle ABC = angle BCX. (alternate interior)
So angle BCX = 87°
Since, angle BCX + angle BCA + angle ACE =180° (linear pair)
So,angle BCA = 180°-(87+75)°
=18°
Also , angle BCA + angle ACD =180° (linear pair)
so angle ACD =180°-18°
==> angle ACD =162°. (ANSWER)
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