1. Circular vocabulary
By Rodolfo Diaz

2. Central angle
• A central angle is an angle whose vertex is the
center of a circle, and whose sides pass
through a pair of points on the circle, thereby
subtending an arc between those two points
whose angle is equal to that of the central
angle itself. It is also known as the arc
segment's angular distance.

3. Central angle

4. Inscribed angel
• : In geometry, an inscribed angle is formed
when two secant lines of a circle intersect on
the circle. Typically, it is easiest to think of an
inscribed angle as being defined by two
chords of the circle sharing an endpoint.

5. Inscribed angle
• example

6. chord
• a group of (typically three or more) notes
sounded together, as a basis of harmony

7. chord
• Ex

8. Area of a circle
• The area of a circle is the number of square
units inside that circle.

9. Area of a circle
• Ex

10. circumference
the enclosing boundary of a curved geometry
figure

11. circumference
• ex

12. radius
• a straight line from the center to the
circumference of a circle or sphere.

13. Radius
• ex

14. diameter
straight line passing from side to side through
the center of a body or figure

15. diameter
• ex

16. sector
an area or portion that is distinct from other

17. sector
• ex

18. Equations of a circle in
Equations of a circle in

19. Mapping notation and transformaion
(x, y) --> x/k + d, ay + c