Formula: If two secants (or tangents) intersect outside a circle, then the product of the lengths of one secant and its external segment is equal to the product of the length of the other secant and its external segment.
In other words: If two secants (or tangents) AB and AC intersect outside a circle, with points A, B, C, and D lying on the circle and segments AD and BC intersecting at point E, then:
AB * AE = AC * AD
Theorem 12-14
Intersecting Secants or tangents
Include Formula
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