# Proofs That Involve Chords, Angles, and Arcs. Part 1

### 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 In PDF Format (no animations)

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.