Which of the following angles is a right angle in standard position?

• A. $10°$
• B. $90°$
• C. $180°$
• D. $50°$

Answer: (B)

Verified step by step guidance

1. Understand that a right angle is an angle that measures exactly 90 degrees.
2. Review the given options: 10°, 90°, 180°, and 50°.
3. Recall the definition of standard position: an angle drawn with its vertex at the origin and its initial side along the positive x-axis.
4. Identify which of the given angles measures exactly 90°, since that is the measure of a right angle.
5. Conclude that the angle measuring 90° is the right angle in standard position.