Which term describes a straight line from the center to the circle's boundary?

Which term describes a straight line from the center to the circle's boundary?

• A. Radius
• B. Diameter
• C. Chord
• D. Tangent

Answer: (D)

The line from the center to any point on the circle’s boundary is a radius. It starts at the center and ends at the edge of the circle, defining a basic measure of the circle. The diameter is that same idea extended straight through the center to the opposite boundary, so it spans the circle’s full width and is twice the length of a radius. A chord is any segment with endpoints on the circle, which may or may not pass through the center. A tangent, on the other hand, touches the circle at exactly one point and is perpendicular to the radius there. So the description fits a radius.

The line from the center to any point on the circle’s boundary is a radius. It starts at the center and ends at the edge of the circle, defining a basic measure of the circle. The diameter is that same idea extended straight through the center to the opposite boundary, so it spans the circle’s full width and is twice the length of a radius. A chord is any segment with endpoints on the circle, which may or may not pass through the center. A tangent, on the other hand, touches the circle at exactly one point and is perpendicular to the radius there. So the description fits a radius.