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Answer:
C. ∠9
D. ∠12
Step-by-step explanation:
The lines that form ∠5 are aligned with the grid, so cross at right angles. That means all of angles 5, 6, 7, 8, 9, 10, 11, and 12 have the same measure, x = 90°. Of these, the ones on your choices list are angles 9 (C) and 12 (D).
