circle - set of all points in a plane at a given distance from a given point in the plane

Parts of a Circle:

radius - segment from point on circle to circles center

center - point in middle of circle with letter next to it

Circles are named by their center point.

This circle is circle A.

What is the name of the circle below?

Circle N

congruent circles - circles with the same radius

These circles are congruent.

arc of a circle - two points on the circle and the unbroken part between the two points

arc of a circleendpoints - the two points that define an arc

NAMING ARCSAn arc is named by its endpoints.

THREE TYPES OF ARCS:semicircle - arc whose endpoints are a diameter (half a circle)

THREE TYPES OF ARCS:semicircle - named using three points on the arc; endpoints listed first and last

THREE TYPES OF ARCS:The blue dashed arc is arc AOB or symbolically...

True or FalseThe name of the orange arc below is…..

True or FalseFALSE…it is

THREE TYPES OF ARCS:minor arc - arc less than a semicircle

THREE TYPES OF ARCS:minor arc - named using the two endpoint letters

THREE TYPES OF ARCS:The blue dashed arc is arc YZ or symbolically...

True or FalseThe name of the orange arc below is…..

True or FalseFALSE. It is…..

THREE TYPES OF ARCS:major arc - arc greater than a semicircle

THREE TYPES OF ARCS:major arc - named using three points on the arc with endpoints listed first and last

THREE TYPES OF ARCS:major arc - named using three points on the arc with endpoints listed first and last

THREE TYPES OF ARCS:The blue dashed arc is arc YXZ or symbolically...

True or FalseThe name of the orange arc below is…..

True or FalseFALSE

chord A segment whose endpoints are on the circle.

chord AB is a chord.

diameter A chord that goes through the center of a circle.

diameter CD is a diameter.

secant -line that goes through two

points of a circle.

secant -line m is a secant

tangent -line that touches circle at only one point

tangent -line p is a tangent

inscribed angle -angle made of two chords

inscribed angle -ABC and BCD are inscribed angles

central angle -angle made of two radii

central angle -COD is a central angle

Name each circle part as either a chord, diameter, secant, tangent, or inscribed angle.

tangent line

chord

secant

central angle

DOA

diameter

inscribed angle