10 1-3 Vocab And concepts

Question 1

Center

Answer 1

The point in the middle of where all points are equidistant in the circle

Question 2

Radius

Answer 2

A segment connecting center to any point in the circle

Question 3

Chord

Answer 3

Segment with both end points on circle

Question 4

Diameter

Answer 4

Chord that goes through center of a circle

Question 5

Radius formula

Answer 5

R=d/2 or 1/2d=r

Question 6

Diameter formula

Answer 6

D=2r

Question 7

Two circles are congruent if and only if…

Answer 7

Their radii are congruent

Question 8

All circles are..

Answer 8

Similar

Question 9

Concentric circles are…

Answer 9

Coplanar circles with the SAME CENTER

Question 10

Central angle

Answer 10

Angle where vertex is center of circle

Question 11

Arc

Answer 11

Portion of a circle defined by 2 end points

Question 12

The sum of the measure of the central angles of a circle with NO INTERIOR points in common

Answer 12

360

Question 13

Minor arc

Answer 13

Shortest arc connecting two end points on a circle; less than 180 and equal to measure of central angle

Question 14

Major arc

Answer 14

Longest arc connecting two end points on a circle; more than 180 and equal to 360 minus the measure of the minor arc with the same endpoints

Question 15

Semicircle

Answer 15

Arc with endpoints that lie on the diameter

Question 16

Congruent arcs

Answer 16

Two arcs located on same/congruent circles or have same measure

Question 17

In same/congruent circles, two arcs are congruent if and only if….

Answer 17

Their central angles are congruent

Question 18

The measure of the arc formed by two adjacent arcs is

Answer 18

The sum of the measures of the two arcs

Question 19

Arc length formula

Answer 19

l/2pir=x/360

Question 20

In the same circle or in congruent circles two minor arcs are congruent if and only if

Answer 20

Their corresponding chords are congruent

Question 21

Circle

Answer 21

Set of all points equidistant from the center