Triangle ABC, B, C has translated 5 units to the right and 4 units up to create triangle A'B'C' What is the measure of ∠B?

someone please help me. i don't get it T^T

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected