1. An Explanation of the terms Diameter, Radius & Circumference.

2. What is the circumference of a circle?

3. 1. The boundary line of a cirle. 2. The boundary line of a figure, area or object. 3. The distance around a circle.

5. What is the diameter of a circle?

6. The length of a straight line passing through the center of a circle or sphere, from one side to the other.

7. Diameter

8. What is the radius of a circle?

9. Any straight line that goes from the center to the outside of a circle or sphere.

10. Radius

11. What is the radius of a circle with a diameter of 16 cm?

12. The radius is 8 cm because half of 16 cm equals 8 cm.