All About Circles

Circles are everywhere!

OP is the radius of the circle

radius: distance from center of circle to any point

on it.

Do circles have more than one

radius?

Yes! They have many radii!

The diameter= 2 times the radius

AB is the diameter

diameter:the longest

distance from one end of a circle to

the other.

If OB is 8, what is the length of AB?

CD is a Chord!

chord: a line segment within a

circle that touches 2 points on the

circle.

FZ is a Tangent

tangent of circle: a line perpendicular

to the radius that touches ONLY one point on the circle

Angle OFC = 90 degrees!

line MR is a Secant

A secantsecant is a line intersectingintersecting a

circle at two two points.points.

Time for a quiz…

Good Job!

Thank you Mrs. Guest-

JohnsonCopyright 2006