Circles Unit Definitions

Question 1

A line lies in the interior of a circle if its…?

Answer 1

Distance from the center is less than the radius.

Question 2

A point lies in the exterior of a circle if it’s…

Answer 2

Distance from the center is greater than the radius.

Question 3

Secant

Answer 3

A line that intersects a circle in exactly two points

Question 4

tangent

Answer 4

A line that intersected a circle in exactly one point

Question 5

Tangent segment

Answer 5

Part of the tangent line between the point of tangency and a point that lies in the exterior of a circle.

Question 6

Concentric circles

Answer 6

Circles hat are coplanar and have the same center

Question 7

Tangent circles

Answer 7

Circles that intersect each other in exactly one point

Question 8

Externally tangent

Answer 8

Two circles in which one lies exterior to each other

Question 9

Internally tangent

Answer 9

Two circles in which one of them lie interior to the other

Question 10

Line of centers

Answer 10

A line that joins the centers of two circles

Question 11

Common tangent

Answer 11

Line of tangent to two (or more circles)

Question 12

Common internal tangent

Answer 12

A tangent line that intersects the line of centers of two circles

Question 13

Common external tangent

Answer 13

A tangent line that does not intersect the line of centers of two circles

Question 14

A circle

Answer 14

The set of all points equidistant from a fixed point

Question 15

Congruent circles

Answer 15

Circles that have congruent radii

Question 16

Chord

Answer 16

A segment whose endpoints are points of the circle

Question 17

Diameter

Answer 17

A chord which contains the center of the circle

Question 18

Radius

Answer 18

Any segment joining a point on the circle to the center