Unit 10- Circles

Question 1

Circle

Answer 1

Set of all the points in a plane that are equidistant from a given point called the center of the circle; notation, if center is point P: (circle with dot in the center) P

Question 2

Chord

Answer 2

A segment whose endpoints are on the circle

Question 3

Diameter

Answer 3

Chord that passes through the center of the circle

Question 4

Radius

Answer 4

Segment that has the center as an endpoint and a point on the circle as the other endpoint; all radii for a given circle are congruent

Question 5

Tangent

Answer 5

A line that intersects a circle at exactly one point; point of tangency is the point at which a tangent intersects a circle

Question 6

Secant

Answer 6

A line that intersects a circle at two points

Question 7

Common Tangent

Answer 7

A line that is a tangent to two circles; EXTERNAL: doesn’t intersect the segment that joins the centers of the circles; INTERNAL: does intersect the segment that joins the centers of the circles

Question 8

Tangent Circles

Answer 8

Circles that have exactly one point of intersection

Question 9

Concentric Circles

Answer 9

Circles that have the same center, but different radii

Question 10

Congruent Circles

Answer 10

Two circles are congruent iff they have congruent radii/diameters