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section 10.1
Tangents to Circle
13
General Vocab
10th Grade
12/21/2005

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Term
Circumference
Definition
Peremiter of the circle.
Distance around edge of circle.
Term
Cord
Definition
Segment conneting 2 pts on the circumferece of the circle.
Term
Congruent Circle's
Definition
Circle's with the same radii.
Term
Secant
Definition
Ray or line that passes thru the circle 2 times.
Term
Tangent
Definition
Ray or line that touches the circle at exactly 1pt, but never enters the circle.
Term
Point of Tangency
Definition
Point where tangent touches the circle.
Term
Interior of Circle
Definition
Inside the circle. The line around the circle (circumference) doesn't count.
Term
Enterior of Circle
Definition
Out side of the circle. The line around the circle (circumference) counts as exterior.
Term
Concetrec Circle's
Definition
Circles with the same center point.
Term
Tangent to a Circle
Definition
a. Common enternal tangents where tangents just touch on top of both circles or on the bottom of both.

b. common internal tangents where tangents touch on top of one and bottom of other or right and left.
Term
Circle's Tangent to each other
Definition
a. Externally tangent where no interior of circle touch and it just touches on one point on exterior.

b.Internallly tangent where one circle is inside the other and there exteriors touch.
Term
Thm.
Definition
If a line is tangent to a circle then it is perpaendicular to the radius drawn to the point of tangency.
Term
Thm.
Definition
If 2 segments from the same exterior point are tangent to a circle then they are congruent.
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