Arcs Teacher Resources

Solve two challenging problems that apply the inscribed angle theorem to find an arc measure or an arc length.

The circumference of a circle is the distance around that circle. Take a look at this tutorial to discover the formulas for the circumference of a circle. [4:22]

Proving that an inscribed angle is half of a central angle that subtends the same arc.

Learn about sectors with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.

This video explores pi and tau, and their relationship to the length of the arc of a circle, the sine graph, and Euler's formula. [16:22]

[Free Registration/Login Required] Students learn how to apply geometric properties and relationships to describe, compare, and draw two dimensional shapes.

Understanding the definition and motivation for radians and the relationship between radians and degrees. [10:51]

Concepts in Trigonometry are explained and illustrated here by a member of the math department at Borough of Manhattan Community College.

A brooch, consisting of a pin, and of a curved portion furnished with a hook. The curved portion was sometimes a circular ring or disc, the pin passing across its centre and sometimes an arc, the pin being as the chord, of the arc. The...

This optical illusion image is known as a Fraser spiral illusion, or false spiral. The black arcs appear to form a spiral when in fact they are a series of concentric circles.