Geometry Circle Theorems
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Tangent segments to a circle from a point outside the circle are _________.
Congruent.

The perpendiculat bisector of a chord is the _______.
Radius.

If two chords are congruent, then they determine two central ______ that are congruent.
Angles.

If two chords in a circle are congruent, then their intercepted _______ are congruent.
Arcs.

The measure of an angle that subtends a semicircle is ______.
90 degrees.

A tangent to a circle is ______ to the radius drawn to the point of tangency.
Perpendicular.

If a quadrilateral is inscribed in a circle, the its opposite angles are ________.
Supplementary.

Inscribed angles that intercept the same arc are ______.
Congruent.

If the vertex of an angle is inside a circle, then the angle measure is half the _______ of the measurment of its intercepted arcs.
Sum.

The measure of an _______ angle is half the measure of the central angle with the same intercepted arc.
Inscibed.