Geometry Terms - chapter 12

Question 1

adjacent arcs

Answer 1

two arcs of the same circle that intersect at exactly one point

Question 2

arc

Answer 2

an unbroken part of a circle consisting of two points on the circle, called endpoints, and all the points on the circle between them

Question 3

arc length

Answer 3

the distance along an arc, measured in linear units

Question 4

central angle of a circle

Answer 4

an angle whose vertex is the center of the circle

Question 5

chord

Answer 5

a segment whose endpoints lie on a circle

Question 6

common tangent

Answer 6

a line that is tangent to two circles

Question 7

concentric circles

Answer 7

coplanar circles with the same center

Question 8

congruent arcs

Answer 8

two arcs that are in the same or congruent circles and have the same measure

Question 9

congruent circles

Answer 9

two circles that have congruent radii

Question 10

exterior of a circle

Answer 10

the set of all points outside a circle

Question 11

external secant segment

Answer 11

a segment of a secant that lies in the exterior of the circle, except for one endpoint on the circle

Question 12

inscribed angle

Answer 12

an angle whose vertex is on a circle and whose sides contain chords of the circle

Question 13

intercepted arc

Answer 13

an arc that consists of endpoints that lie on the sides of an inscribed angle and all the points of the circle between the endpoints

Question 14

interior of a circle

Answer 14

the set of all points inside a circle

Question 15

major arc

Answer 15

an arc of a circle whose points are on or in the exterior of a central angle

Question 16

minor arc

Answer 16

an arc of a circle whose points are on or in the interior of a central angle

Question 17

point of tangency

Answer 17

the point of intersection of a circle or sphere with a tangent line or plane

Question 18

secant of a circle

Answer 18

a line that intersects a circle at two points

Question 19

secant segment

Answer 19

a segment of a secant with at least one endpoint on the circle

Question 20

sector of a circle

Answer 20

a region inside a circle bounded by two radii of the circle and their intercepted arc

Question 21

segment of a circle

Answer 21

a region inside a circle bounded by a chord and an arc

Question 22

semicircle

Answer 22

an arc of a circle whose endpoints lie on a diameter

Question 23

subtend

Answer 23

a segment or arc subtends an angle if the endpoints of the segment or arc lie on the sides of the angle

Question 24

tangent of a circle

Answer 24

a line that is in the same plane as a circle and intersects the circle at exactly one point

Question 25

tangent circles

Answer 25

two coplanar circles that intersect at exactly one point

Question 26

tangent segment

Answer 26

a segment of a tangent with one endpoint on the circle