Secant-Tangent Product Theorem:
B
If a secant and a tangent intersect in the exterior of a circle, then
the product of the lengths of the secant segment and its external
segment equals the length of the tangent segment squared.
AC-BC=DC2
Intersecting Chords Angle Measure Theorem:
If two secants or chords intersect in the
of a circle,
then the measure of each angle formed is,
measures of its
the _
of the
arcs.
Chords AD and BC intersect at E.
==
m21 = (mAB+ mCD)
Tangent-Secant Interior Angle Measure Theorem:
If a tangent and a secant (or a chord) intersect on a circle at the
then the measure of the
formed is
arc.
the measure of its
Tangent BC and secant BA intersect at B.
8
8