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the measure of the minor arc is equal to the measure of
its corresponding central angle

If a line is tangent to a circle, then the line is
perpendicular to the radius at the point of tangency

If two tangent segments to a circle share a common endpoint outside the circle
then the two segments are congruent

Within a circle or in congruent circles, congruent central angles have congruent
chords

Within a circle or in congruent circles, chords equidistant from the center are
congruent

In a circle, if a diameter is perpendicular to a chorde then
it bisects the chord and its arc

The measure of an inscribed angle is
half the meausre of its intercepted arc

The measure of an angle formed by a tangent and a chord is
half the measure of the intercepted arc

The measure of an angle formed by two lines that intersect inside a circles is
half the sum of the measures of the intercepted arcs. 1/2(x+y)

