The correct theorem or definition that justifies the given statement for the diagram is; Definition of a Right angle Triangle
What is the angle postulate?
We are given that;
∠MRS ≅ ∠MRO
Now, what that means is that ∠MRS is congruent to ∠MRO. Thus, to understand this concept of equality or congruence, we can prove it since from the given image, we see that;
m∠MRS = m∠MRO = 90°
Since they are both right angles then we can say that the correct theorem is the definition of a right angle triangle.
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