Need help for this problem. It's geometry as far as I know.

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.