The postulate that justifies the statement below the given diagram is the: angle addition postulate.
What is the Angle Addition Postulate?
According to the angle addition postulate, the sum of the measures of two angles that make up a bigger equals the measure of the bigger angle.
Two small angles, MRO and MRS add up to give the bigger angle, SRO, which contains both angles.
Therefore, the postulate that justifies, m∠MRO + ∠MRS = m∠SRO, is: angle addition postulate.
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