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Question 1

Circle

Answer 1

The set of points in a plane at a given distance (radius) from a given point (center) in that plane

Question 2

Center

Answer 2

The given point

Question 3

Radius

Answer 3

The given distance; all radii of a circle are congruent

Question 4

Chord

Answer 4

A SEGMENT whose endpoints lie on a circle

Question 5

Secant

Answer 5

A LINE that contains a chord

Question 6

Diameter

Answer 6

a CHORD that contains the center of a circle

Question 7

Tangent

Answer 7

a line in the plane of a circle that intersects the circle at exactly one point

Question 8

Sphere

Answer 8

(with center O and radius R) the set of all points in space at a distance R from point O

Question 9

Congruent Circles (Or spheres)

Answer 9

Circles (Or spheres) that have congruent radii

Question 10

Concentric circles

Answer 10

Circles that lie in the same plane and also have the same center

Question 11

Concentric spheres

Answer 11

Spheres that have the same center

Question 12

A polygon that is inscribed in a circle means

Answer 12

all the vertexs of the the polygon lies on the circle

Question 13

Tangent theorem!!

If a line is a tangent to a circle,

Answer 13

then the line is perpendicular to the radius drawn to the point of tangency

Question 14

Point of tangency

Answer 14

where the tangent line meets the circle

Question 15

Tangent theorem again, but converse of the last!!

If a line in the plane of the circle is perpendicular to the radius,

Answer 15

Its a tangent line

Question 16

Tangents to a circle from a point are

Answer 16

congruent

Question 17

Common tangent

Answer 17

A line that is tangent to each of two coplanar circles

Question 18

Common internal tangent

Answer 18

Intersects the segment joining the centers

Question 19

Common external tangent

Answer 19

Does not intersect the segment joining the centers

Question 20

Tangent circles

Answer 20

coplanar circles that are tangent to the same line at the same point