Complementary angles are two angles that add up to 90 degrees.
Let's look at the given angles: 17°, 34°, 90°, 120°, and 73°.
Now we can check the pairs:
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17° + 34° = 51° (not complementary)
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17° + 90° = 107° (not complementary)
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17° + 120° = 137° (not complementary)
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17° + 73° = 90° (complementary)
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34° + 90° = 124° (not complementary)
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34° + 120° = 154° (not complementary)
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34° + 73° = 107° (not complementary)
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90° + 120° = 210° (not complementary)
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90° + 73° = 163° (not complementary)
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120° + 73° = 193° (not complementary)
From the checks, the angles 17° and 73° are the pair that correspond to complementary angles since they add up to 90°.
Thus, the two angle measures that are complementary are 17° and 73°.