12-6: Segment Relationships in Circles segments of a chord
12-6: Segment Relationships in Circles When two chords intersect inside a circle, each chord is divided into two segments called segments of a chord.
Theorem: If two chords intersect inside a circle, then the product of the segment lengths of one chord is equal to the product of the segment lengths of the other chord.
EA i EB = EC i ED
EX 1) Find the value of x.
In the figure, PS is a tangent segment because it is tangent to the circle at an endpoint (S). PR is a secant segment because one of the two intersection points with the circle is an endpoint (R). PQ is the external segment of PR .
Theorem: If two secant segments share the same endpoint outside a circle, then the product of the lengths of one secant segment and its external segment equals the product of the lengths of the other secant segment and its external segment.
EA i EB = EC i ED
EX 2) Find the value of x.
Theorem: If a secant segment and a tangent segment share an endpoint outside a circle, then the product of the lengths of the secant segment and its external segment equals the square of the length of the tangent segment.
(EA)2 = EC i ED
EX 3) Find the value of x.
Challenge: EX 4) Find the value of x and y.
EX 5) Is BC a diameter of the circle? (Hint: What do you recall about a radius intersecting a tangent at the point of tangency?)
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