Which of the following angles in standard position has a positive measure?

• A. $-120°$
• B. $-60°$
• C. $45°$
• D. $0°$

Answer: (C)

Verified step by step guidance

1. Recall that an angle in standard position is measured starting from the positive x-axis, moving counterclockwise for positive angles and clockwise for negative angles.
2. Identify the sign of each given angle: negative angles (like -120° and -60°) indicate clockwise rotation, so these are negative measures.
3. Positive angles are those measured counterclockwise from the positive x-axis, so any angle greater than 0° is positive.
4. Among the given options, 45° and 0° are non-negative, but 0° is neither positive nor negative; it is the starting point.
5. Therefore, the angle with a positive measure is the one greater than 0°, which is 45°.