An architect is planning security lights for the outside of a circular stadium. He wants each light to illuminate the stadium so that. What is the measure in degrees of \angle XYZ?

Sasha delivers newspapers to subscribers that live within a 4 block radius of her house. sasha's house is located at point (0, -1). points a, b, c, d, and e represent the houses of some of the subscribers to the newspaper. to which houses does sasha deliver newspapers?