What is the space between two lines or planes that intersect in degrees called?

• A. Radius
• B. Diameter
• C. Arc
• D. Angle

Answer: (D)

An angle is the measure of how much one direction must be rotated to align with another, or, in geometry, the space between two lines or planes that intersect. When two lines cross, they form four angles at the intersection; opposite angles are equal and adjacent angles sum to 180 degrees, so you’ll see combinations like an acute angle paired with an obtuse one. Angles are measured in degrees (or radians) and can be acute, right, or obtuse. For planes, the angle between them is the dihedral angle, defined as the angle between lines drawn perpendicular to the line of intersection within each plane (or equivalently between the planes’ normals). This all captures the same idea: a measure of how far one direction is from another when the objects meet.