Identifying Parts of a Circle

Teacher Bell introduces the concept of circles, covering key parts such as the circumference, center, radius, diameter, chords, arcs, and tangents. The video includes definitions, illustrations, and exercises to reinforce understanding. The diameter is explained as twice the radius, and the chord is defined as a line segment within the circle. Tangents are lines that touch the circle at one point. The video concludes with exercises to identify circle parts.

What is the term used for the line segment from the center of a circle to any point on its circumference?

• Chord

• Radius

• Diameter

• Arc

If the radius of a circle is 20 cm, what is the diameter?

• 40 cm

• 20 cm

• 10 cm

• 80 cm

Which line segment passes through the center of the circle and has endpoints on the circle?

• Diameter

• Chord

• Radius

• Tangent

What do we call a line segment that lies inside a circle and does not pass through the center?

• Arc

• Radius

• Diameter

• Chord

What is formed when a diameter divides the circle?

• Two chords

• Two arcs

• Two tangents

• Two semicircles

What is the name of a line that touches a circle at exactly one point?

• Chord

• Diameter

• Tangent

• Radius

What is the point called where a tangent touches the circle?

• Tangent point

• Point of tangency

• Radius point

• Chord point

What part of the circle is described as a segment of its circumference?

• Arc

• Radius

• Chord

• Diameter

Identify the part of the circle that is half of it, formed by a diameter.

• Quadrant

• Semicircle

• Arc

• Chord

What is the longest chord in a circle called?

• Arc

• Tangent

• Diameter

• Radius