Parts of Circles

Define the term 'Circle'.

• The set of points equidistant from a given point (the center).

• A polygon with three sides.

• A shape with four equal sides and angles.

• A solid figure with six faces.

Define the term 'Radius'.

• A segment with endpoints at the center and on the circle.

• A line that touches the circle at one point.

• A segment that passes through the center and has both endpoints on the circle.

• A line that divides the circle into two equal parts.

Define the term 'Chord'.

• A segment with endpoints on the circle.

• A line that touches the circle at one point.

• A line passing through the center of the circle.

• A curve that is part of the circle.

Define the term 'Diameter'.

• A chord that passes through the center. (Diameter = 2 * radius)

• A line segment that does not pass through the center.

• A curve that encloses the circle.

• A point on the circumference.

Define the term 'Secant'.

• A line that intersects the circle in two places.

• A line that touches the circle at exactly one point.

• A line that does not intersect the circle.

• A line that is tangent to the circle.

Define the term 'Tangent'.

• A line that intersects the circle at exactly one place.

• A line that intersects the circle at two places.

• A line that does not intersect the circle.

• A line that is parallel to the circle.

Define the term 'Point of Tangency'.

• The point at which the tangent line intersects the circle.

• The center of the circle.

• A point inside the circle.

• A point outside the circle.

What is a central angle?

• An angle whose vertex is the center of a circle

• An angle formed by two radii of a circle

• An angle that measures 90 degrees

• An angle that measures 180 degrees

What is an inscribed angle?

• An angle formed by two chords in a circle which have a common endpoint.

• An angle formed by two radii of a circle.

• An angle formed by a tangent and a chord.

• An angle formed by two secants of a circle.

What is an arc?

• A curved line that is part of the circumference of a circle

• A straight line connecting two points

• A closed loop

• A three-dimensional shape