Multiple choice general knowledge science & technology A right angle is ..... 45° 90° 180° 360° Reveal answer Fill a bubble to check yourself B Correct answer Explanation A right angle is exactly 90 degrees, which is one-quarter of a full 360-degree rotation. It's the angle formed when two lines are perpendicular to each other. 45° is half of a right angle, 180° is a straight line, and 360° is a complete rotation.