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In the figure shown, which pair of angles must be complementary?

A.∠COD and ∠DOB

B.∠AOC and ∠COD

C. ∠AOC and ∠DOB

D. ∠COB and ∠AOC

A because angle COB forms a right angle, and complementary angles add up to form 90°. Since ray D kind of intersects angle COB, the two angles formed will add up to 90.

These two angles are COD and DOB.

d

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