1. Intro to Algebra/Geometry
Circles
Intro to Algebra/Geometry

2. CIRCLE
A circle is the set of all points that are the same distance from a fixed point called the center.

3. RADIUS
The distance from the center to a point on the circle is the radius of the circle. All radii of a circle are congruent.

4. DIAMETER
The distance across the circle, through its center, is the diameter of the circle.

5. The diameter is twice the radius.

6. Examples
The diameter of a circle is 15cm. What is the measure of the radius?
The radius of a circle is 6in. What is the measure of the diameter?

7. Find the radius and diameter.

8. Find the radius and diameter.

9. Circumference
The distance around a circle is its circumference.

10. Circumference

11. Find the Circumference

12. Find the Circumference

13. Area

14. Find the Area

15. Find the Area