Which statement describes the diameter of a circle?

Which statement describes the diameter of a circle?

• A. A line perpendicular to the circle
• B. The distance around the circle
• C. A line tangent to the circle
• D. The length of a line that passes through the center and connects two points on the circle

Answer: (D)

The diameter is the line segment that passes through the center of a circle and connects two points on the circle. This makes it the longest chord and also means its length is twice the circle’s radius. That exact description matches the statement. The other descriptions refer to different circle concepts: a line around the circle describes the circumference, a line tangent touches the circle at one point, and a line perpendicular to the circle does not define a diameter.

The diameter is the line segment that passes through the center of a circle and connects two points on the circle. This makes it the longest chord and also means its length is twice the circle’s radius. That exact description matches the statement. The other descriptions refer to different circle concepts: a line around the circle describes the circumference, a line tangent touches the circle at one point, and a line perpendicular to the circle does not define a diameter.