Name That Part

$\small\mathsf{ \overline {AB}}$
$\small\mathsf{ \overline {FC}}$
$\small\mathsf{ \overline {GH}}$
$\small\mathsf{ \overline {FD}}$

$\small\mathsf{ \overline {AB}}$ is a segment whose endpoints are on the circle.

A chord has endpoints on the circle.

$\small\mathsf{ \overline {AB}}$
$\small\mathsf{ \overline {FC}}$
$\small\mathsf{ \overline {GB}}$
$\small\mathsf{ \overline {ED}}$

A radius is a segment that has the center as one endpoint and the other endpoint is on the circle.

$\small\mathsf{ \overline {FC}}$ is a segment that has the center as one endpoint and the other endpoint is on the circle.

A radius is a segment that has the center as one endpoint and the other endpoint is on the circle.

$\small\mathsf{ \overline {AB}}$
$\small\mathsf{ \overline {FC}}$
$\small\mathsf{ \overline {ED}}$
$\small\mathsf{ \overline {EC}}$

A diameter is a segment that has endpoints are on the circle and goes through the center.

$\small\mathsf{ \overline {EC}}$ is a segment that has endpoints on the circle and goes through the center.

A circle is a set of points that are equidistant from a given point, the center. The black "line" in the non-shaded diagram is the circle.

A circle is a set of points that are equidistant from a given point, the center. The black "line" in the non-shaded diagram is a circle. The blue shaded area is the area of the circle, not the circle itself.

$\small\mathsf{ \overline {AB}}$
$\small\mathsf{ \overleftrightarrow {AB}}$
$\small\mathsf{ \overleftrightarrow {GH}}$
$\small\mathsf{ \overline {GH}}$

A tangent is a line that intersects the circle in exactly one point.

$\small\mathsf{ \overleftrightarrow {GH}}$ is a line that intersects the circle in exactly one point.

A tangent is a line that intersects the circle in exactly one point.

$\small\mathsf{ \overline {AB}}$
$\small\mathsf{ \overleftrightarrow {AB}}$
$\small\mathsf{ \overleftrightarrow {GH}}$
$\small\mathsf{ \overline {GH}}$

A secant is a line that intersects the circle in two points.

$\small\mathsf{ \overleftrightarrow {AB}}$ is a line that intersects the circle in two points.

A secant is a line that intersects the circle in two points.

How well can you identify the parts of a circle?

1. Which segment in this circle is a chord?

2. Which segment in the circle below is a radius?

3. Which segment in this circle is a diameter?

4. Which diagram shows a correct drawing of a circle, using the formal definition of a circle?

5. Which choice is a tangent in the following circle?

6. Which choice is a secant in the following circle?

Summary