Naming Parts of Circles

How do you identify a sector in a diagram?

• A sector is typically represented as a 'pizza slice' shape within the circle.

• A sector is represented as a straight line across the circle.

• A sector is shown as a small dot in the center of the circle.

• A sector is depicted as a triangle within the circle.

What is the center of a circle?

• The point that is equidistant from all points on the circle.

• The point where the diameter intersects the circumference.

• The point at the edge of the circle.

• The point that defines the radius of the circle.

What is a radius?

• A line segment from the center of the circle to any point on its circumference.

• A line that connects two points on the circumference of a circle.

• The distance around the circle.

• A line segment that passes through the center of the circle and connects two points on the circumference.

What is a semicircle?

• A shape with three equal sides.

• Half of a circle, formed by a diameter and the arc connecting its endpoints.

• A full circle divided into two equal parts.

• A polygon with four sides.

What is the circumference of a circle?

• C = πd

• C = 2πr

• C = r^2

• C = 2r

What is a diameter?

• A straight line passing from side to side through the center of a circle, measuring twice the radius.

• The distance around the edge of a circle.

• A line segment that connects two points on a circle's circumference.

• The area of a circle divided by its radius.

What is a tangent?

• A line that intersects the circle at two points.

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

• A line that is parallel to the radius of the circle.

• A line that forms a right angle with the circle.

What is a central angle?

• An angle whose vertex is at the center of the circle and whose sides are radii.

• An angle formed by two tangents to a circle.

• An angle that measures more than 180 degrees.

• An angle whose vertex is outside the circle.

What is a sector in a circle?

• A sector is a portion of a circle enclosed by two radii and the arc between them.

• A sector is the area of a circle that is completely filled in.

• A sector is the distance around the circle.

• A sector is a line segment that connects two points on the circle.

What is an arc?

• A straight line connecting two points on a circle.

• A part of the circumference of a circle.

• The center point of a circle.

• A polygon with three sides.