7. Given that line n is perpendicular to line m, what are the measures of angles 1, 2, 3, and 4.
nim
90°, 90°, 180°, 180°
180°, 90°, 180°, 90°
0
45°, 45°, 45°, 45°
90°, 90°, 90°, 90°
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