Answer:
90°.
Step-by-step explanation:
When two straight lines intersects obliquely then there will be two angle of intersection, one angle is acute and the other one is obtuse.
But, here the two straight lines AB and xy intersects perpendicularly and AB bisects xy.
Therefore, the two angle of intersection are 90° each.
Hence, the angle of intersection in our case will be equal to 90°. (Answer)
