Answer:
1. Radius
A radius of a circle is a line segment which goes from the center of a circle to a point on the circle.
2. Diameter
A chord is a line segment whose endpoints are on a circle. If a chord passes through the center of the circle, it is called a diameter.
3. Chord
Any straight line segment connecting two points on a circle or ellipse is called a chord.
4. Diameter
A chord that passes through the center of a circle is called a diameter and is the longest chord.
5. Minor Arc
A minor arc is an arc smaller than a semicircle.
6. Semicircle
An arc whose length is exactly one-half of the circumference of the circle is simply called a semi-circle.
7. Major Arc
A major arc is an arc larger than a semicircle. A central angle which is subtended by a major arc has a measure greater than 180°.
8. Inscribed Angle
An inscribed angle is an angle whose vertex lies on a circle and its two sides are chords of the same circle.
9. Central Angle
A central angle is an angle whose vertex is located at the center of the circle and whose sides are radii.
10. Intercepted Arc
The arc that lies in the interior of an inscribed angle and has endpoints on the angle is called the intercepted arc of the angle.
