### This is a collection of proofs that has chords forming inscribed angles, intersecting congruent arcs, or intersecting angles, or similar embedded triangles. Proofs show a step by step solution that highlights all features in the associated figure, as the proof is built. Use your time to take advantage of interacting with the lesson solving the listed problems using your stylus and the marker tools menu at the top of the screen.

** Lesson's Content **

** Lesson's Glossary **

Arc

Curved segment in a circle.

Center of a circle

The point that all points in the circle are equidistant from

Central angle of a circle

An angle whose vertex is the center of the circle

Chord of a circle

A segment whose endpoints are on a circle

Circle

The set of points on a plane at a certain distance (radius) from a certain point (center); a polygon with infinite sides

Postulate

A statement assumed to be true without proof.

Proof

A sequence of justified conclusions used to prove the validity of an if-then statement.

Radii

Plural form of radius

Radius

The segment whose endpoints are any point on a circle or sphere and its center; the length of that segment

Semicircle

An arc whose central angle is a right angle.

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