Answer:
(a) 4x=5(x-18)
(b) ∠A=∠B=360°
Explanation:
Corresponding angles : when two lines are crossed by a transversal , the angle in matching corners are called corresponding angles.
Since the corresponding are congruent.
Therefore,
∠A=∠B
⇔4x=5(x-18)
⇔4x=5x-90
⇔4x-5x=-90
⇔-x=-90
⇔x=90
Therefore ∠A=∠B= 4×90°=360°