1. to extend under or be opposite to
Usage: geometry; mathematics
2. to form an angle at a given point when lines are drawn from that point to the endpoints
Usage: geometry

Examples

• The arc subtends an angle of 60 degrees at the center of the circle.
• This chord subtends a right angle at the circumference.
• The base of the triangle subtends the largest angle.
• The diameter subtends a semicircle.
• Each side of the polygon subtends equal angles at the center.
• The rainbow subtends about 42 degrees of arc in the sky.