How is the diameter related to the radius?

How is the diameter related to the radius?

• A. The diameter equals the radius.
• B. The diameter is twice the radius.
• C. The diameter is the circumference.
• D. A line from the center to a point on the circle.

Answer: (B)

Understanding the relationship between radius and diameter: the diameter is twice the radius. The radius is the distance from the center of the circle to any point on the circle. The diameter is a straight line that passes through the center and connects opposite points on the circle, so its length is two radii added together. For example, if the radius is 4 units, the diameter is 8 units. The diameter is not equal to the radius, and it is not the circumference (the circumference is the distance around the circle, 2πr). A line from the center to a point on the circle is a radius, not the diameter.

Understanding the relationship between radius and diameter: the diameter is twice the radius. The radius is the distance from the center of the circle to any point on the circle. The diameter is a straight line that passes through the center and connects opposite points on the circle, so its length is two radii added together. For example, if the radius is 4 units, the diameter is 8 units. The diameter is not equal to the radius, and it is not the circumference (the circumference is the distance around the circle, 2πr). A line from the center to a point on the circle is a radius, not the diameter.