Lesson 11.1 Parts of a Circle

Pages 589 - 590

Parts of a Circle

• A chord is a segment whose endpoints are points on a circle.

• A diameter is a chord that passes through the center of the circle.

• A radius is a segment whose endpoints are the center of a circle and a point on the circle.

Parts of a Circle

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

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

• A point of tangency is the point where a tangent line intersects the circle.

Identify the special segments and lines.

• AD• EG• HB• JK• F• AC

B

CH

A

D

G F E

J

K

Identify the following:

• Chord:• Tangent• Radius• Center of circle• Point of tangency• Diameter• Secant

B

CH

A

F

E

J K

Coordinate Circles• Name the coordinates of the center

of each circle

• Name the coordinates of the intersection of the two circles

• What line is tangent to both circles?

• Name the coordinates of the point of tangency

• What is the length of the diameter of circle B? What is the length of the radius of circle A?

Assignment:

11.1 pages 591 - 593#2-48 even