Practice interesting area and circumference problems. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Explore everything about circles. Learn various parts of a circle like a diameter, radius, circumference, circles chord, tangent circles, major arc, segment, sector, and discover other interesting aspects of it. Try your hand at solving...

The Math Forum offers an archive of question and answer sessions on circles and how they relate to geometry.

This reference tool explores the radius of a circle. Provides definitions, solved examples, and practice questions with answers.