How to know if two angles are congruent

Which is the scale factor proportion for the enlargement shown?

If cos(θ)=2853 with θin q iv, what is sin(θ)?

The patient recovery time from a particular surgical procedure is normally distributed with a mean of 5.2 days and a standard deviation of 1.7 days. what is the probability of spending more than 2 days in recovery? (round your answer to four decimal places.)