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The angle between the first and third rays is marked as a right angle, so it is equal to 90°.
The angle between the first and second rays is labeled as (x+4)°.
The angle between the second and third rays is labeled as (3x+2)°.
Therefore, the two unknown angle measures that form the 90° angle are:
(x+4)° = unknown angle measure
(3x+2)° = unknown angle measure