15 terms

# geom 10.3/10.4

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Tangent of a circle
Is a line that intersects a circle at exactly 1 point (point of tangency / contact)
Postulate 1: a tangent line is perp to the radius drawn
To the point of tangency
Postulate 2: is a line is perp to a radius at its outer endpoint then it is a
tangent to the circle
External part of the secant
Part of the secant that forms a segment that joins the outside point to the nearer intersection point
Thm 85: is 2 tangent segment s are drawn to a circle from the external point
Then they are congru
Tangent circles
Crcles that intersect at exactly 1 point
Common tangent to circle
Is a line thangent to 2 circle at the same time
Congruent archs
2 archs are congruent whenever they have the same measure and are parts of the same circle or congruent cirles
In the same circle or congruent cirlces, 3 things will always be equall
Chords, archs and central angles of the same thing
Thm 79: if 2 central angles of a circle(s) are congruent, then
Their intercepted archs are congruent
Thm 80: if 2 arcs of a circle(s) are congruent then the corresponding
Central angles are congruent
Thm 81: if 2 central angles of a circle(s) are congruent them
The corresponding central angles are congruent
Thm 82: if 2 chords of a circle(s) are congruent, then the corresponding
Central angles are congruent
Thm 83: if 2 archs of a circle(s) arecongruent then the corresponding
Chords are congruent
Thm 84: if 2 chords of a circle(s) are congruent, then the corresponding
Arcs are congruent