From the provided image, let's define and identify each of the requested elements related to the circle $O$:

1. All Radius:

A radius connects the center $O$ of the circle to any point on the circle. In the diagram:

• $\overline{OA}$
• $\overline{OB}$
• $\overline{OC}$
• $\overline{OD}$

2. A Diameter:

A diameter is a chord passing through the center $O$ of the circle, dividing it into two equal halves. In the diagram:

• $\overline{CD}$

3. All Chords:

A chord is a line segment whose endpoints lie on the circle. In the diagram:

• $\overline{CD}$ (diameter is also a chord)
• $\overline{AB}$

4. All Minor Arcs:

A minor arc is the smaller arc between two points on a circle. In the diagram:

• $\widehat{CB}$
• $\widehat{BD}$
• $\widehat{DC}$
• $\widehat{AC}$

5. All Major Arcs:

A major arc is the larger arc between two points on a circle. In the diagram:

• $\widehat{CBA}$
• $\widehat{BAD}$
• $\widehat{DCA}$

6. All Semicircles:

A semicircle is an arc that represents half the circle. In the diagram:

• $\widehat{CAB}$
• $\widehat{DAB}$

7. All Central Angles:

A central angle is an angle whose vertex is at the center of the circle. In the diagram:

• $\angle AOB$
• $\angle COD$

8. An Inscribed Angle:

An inscribed angle is an angle formed by two chords with the vertex on the circle. In the diagram:

• $\angle CAB$

9. All Tangent Lines:

A tangent line touches the circle at exactly one point. In the diagram:

• $\overleftrightarrow{FH}$
• $\overleftrightarrow{GL}$

10. All Secant Lines:

A secant line intersects the circle at two points. In the diagram:

• $\overleftrightarrow{HE}$
• $\overleftrightarrow{BG}$

Let me know if you need detailed explanations for any specific component or clarifications.

Related Questions:

1. What is the relationship between a central angle and its intercepted arc?
2. How do tangent lines differ from secant lines geometrically?
3. What formulas can you use to find the length of a chord or arc in a circle?
4. How does the inscribed angle relate to the arc it subtends?
5. What is the total measure of angles around the center of the circle?

Tip:

For solving geometry problems related to circles, remember