Circle Geometry Concepts

This video tutorial covers essential circle vocabulary, including definitions of a circle, chords, radius, and diameter. It explains central angles and different types of arcs, such as minor arcs. The tutorial includes practice problems to reinforce understanding and discusses arc measurement and congruent arcs.

What is the definition of a circle?

• A line segment with two endpoints

• A polygon with three sides

• A set of points equidistant from a center point

• A shape with four equal sides

How do you name a circle?

• By its circumference

• By the center point

• By its diameter

• By its radius

What is a chord in a circle?

• A line segment with endpoints on the circle

• A line that touches the circle at one point

• A line that passes through the center

• A line that is outside the circle

What is the relationship between the radius and diameter?

• Radius is twice the diameter

• Diameter is twice the radius

• Radius is half the circumference

• Diameter is half the circumference

What is a central angle?

• An angle formed by two chords

• An angle outside the circle

• An angle with its vertex at the center of the circle

• An angle formed by a tangent and a chord

What is a minor arc?

• An arc greater than 180°

• An arc less than 180°

• An arc that is a full circle

• An arc equal to 180°

How do you find the measure of an arc?

• By measuring the radius

• By measuring the diameter

• By using the central angle

• By measuring the circumference

What is the measure of arc AB if the central angle is 60°?

• 60°

• 120°

• 180°

• 240°

If arc ACB is 264°, what is the measure of the central angle?

• 96°

• 264°

• 360°

• 180°

What is the measure of arc AE if E to B is a diameter?

• 96°

• 90°

• 84°

• 180°