1. The problem asks for the complement of 30°. 2. Complementary angles are two angles whose measures add up to 90°. 3. The formula for the complement of an angle $x$ is: $$\text{complement} = 90^\circ - x$$ 4. Substitute $x = 30^\circ$: $$\text{complement} = 90^\circ - 30^\circ$$ 5. Calculate the difference: $$\text{complement} = 60^\circ$$ 6. Therefore, the complement of 30° is 60°. Note: Supplementary angles add up to 180°, so the statement "supplementary angles add to 60°" is incorrect. The supplement of 60° is: $$180^\circ - 60^\circ = 120^\circ$$ But since the question is about the complement of 30°, the answer is 60°.