Parts of a circle

Question 1

In a circle, point O is the center. Points A and B are opposite ends of a straight line that passes through O, and point C is a point on the edge of the circle. Which answer correctly names the radius, the diameter, and the circumference?

Accepted Answer

Radius = line segment OC; Diameter = line segment AB; Circumference = the curved line around the circle.

Answer

Radius = the curved line around the circle; Diameter = line segment OC; Circumference = line segment AB.

Answer

Radius = line segment OC; Diameter = the curved line around the circle; Circumference = line segment AB.

Answer

Radius = line segment AB; Diameter = line segment OC; Circumference = the distance across the circle.

Question 2

Which sentence correctly describes how the radius and diameter of a circle are related?

Accepted Answer

The diameter is twice as long as the radius.

Answer

The diameter and the radius are the same length.

Answer

The radius is twice as long as the diameter.

Answer

The radius is the distance around the circle.

Question 3

If the radius of a circle is 4.5 cm, what is the diameter of the circle?

Accepted Answer

9 cm

Answer

13.5 cm

Answer

4.5 cm

Answer

2.25 cm

Try three questions

In a circle, point O is the center. Points A and B are opposite ends of a straight line that passes through O, and point C is a point on the edge of the circle. Which answer correctly names the radius, the diameter, and the circumference?

Which sentence correctly describes how the radius and diameter of a circle are related?

If the radius of a circle is 4.5 cm, what is the diameter of the circle?

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