How do i estimate an angle in degrees?

Need solving this 2nd limit problem.

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?

Pls math have no ideamultiply and simppify. 2x^2y^3z^2 • 4xy^4x^2