Central & Inscribed Angles

Arcs & Central Angles

In geometry, arcs aren't measured by inches and meters, they're measured by the central angle which includes that arc. What's a central angle? What's a major and minor arc? Stick around and find out!

Inscribed Angles

This video explains the theorems and corollaries involved with inscribed angles, as well as how to solve for missing angles in a circle whether they're inscribed angles, central angles, or arcs. Also covered is a common example: crisscrossing triangles (formed from intersecting chords) which are always similar.

Inscribed Angle Proofs

In this video I work a few proofs, including proving Case 1 of the inscribed angle theorem which shows that inscribed angles are half the measure of the central angle.