Perpendicular is defined as being at what angle to a line, plane, or surface?

Perpendicular is defined as being at what angle to a line, plane, or surface?

• A. 0 degrees
• B. 180 degrees
• C. 90 degrees
• D. 45 degrees

Answer: (C)

Perpendicular means forming a right angle with another line, plane, or surface. A right angle is 90 degrees, so when something is perpendicular to a line, plane, or surface, it meets at 90 degrees. In carpentry, this is the standard for a perfectly square corner or joint, and a carpenter’s square is used to verify it. If the angle were 0 degrees, the lines would be parallel; 180 degrees would have them in line but opposite direction; and 45 degrees would be slanted, not at right angles.

Perpendicular means forming a right angle with another line, plane, or surface. A right angle is 90 degrees, so when something is perpendicular to a line, plane, or surface, it meets at 90 degrees. In carpentry, this is the standard for a perfectly square corner or joint, and a carpenter’s square is used to verify it. If the angle were 0 degrees, the lines would be parallel; 180 degrees would have them in line but opposite direction; and 45 degrees would be slanted, not at right angles.