A circle is a closed curve where all points are equidistant from a fixed central point called the vertex. Key parts of a circle include the radius, which connects the center to any point on the circle, the diameter which passes through the center, and the chord which connects any two points on the circle. Other terms are the secant which intersects the circle at two points, the tangent which touches the circle at one point, and arcs which are portions of the circle.

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.