1. CIRCLES

2. CIRCLE
• A closed curve figure, all
points of which are
equidistant from a fixed point
called vertex.

3. Parts of a
circle

4. RADIUS
• A segment whose endpoints are in
the center of the circle and the
other endpoint is on the circle.

5. Chord
• Is a segment whose
endpoints are any two points
on the circle.

6. Diameter
• A chord which passes
through the center of a
circle.

7. Secant
• Line that intersects the circle at two
points

8. Tangent
• Is a line in the plane of a
circle that intersects the
circle at exactly one point.
This point is called the point
of tangency.

9. Central Angle
• An angle formed by two radii
of a circle with vertex on the
center of the circle.

10. Arc
• A part or a portion of a
circle.

11. Semi - circle
• Half of a circle, it
measures 180 .

12. Minor Arc
• Less than half of a circle

13. Major Arc
• More than half a circle.