Analyze Math
Analyze Math: Inscribed and Central Angles in Circles
The geometry tutorial investigates the definitions and theorems related to inscribed and central angles in circles. An example with a detailed solution is included.
University of Georgia
University of Georgia: Inter Math: Exterior Angles
Intermath Dictionary's site defines terms relating to angles, gives examples, and offers interactive exercises.
CK-12 Foundation
Ck 12: Geometry: Arcs and Angles Study Guide
This study guide on arcs and angles covers key vocabulary, arc measurement in degrees and radians, congruent arcs, bisecting arcs, and the angles on, inside, and outside a circle. Also covers formulas and theorems. It is available for...
CK-12 Foundation
Ck 12: Geometry: Inscribed in Circles Study Guide
This study guide on circles covers some vocabulary terms, and inscribed angles and polygons. It is available for download with free registration.
Math Open Reference
Math Open Reference: Central Angle
A handy reference guide to central angles. It provides definitions, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Inscribed Angle
Learn about inscribed angles with this handy reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Khan Academy
Khan Academy: Inscribed Angles
Practice the relationship between inscribed & central angles that are subtended by the same arc length.
CK-12 Foundation
Ck 12: Interactive Geometry: 8.4 Inscribed Angles
Learn about inscribed angles formed by two chords in a circle which have a common endpoint.
Khan Academy
Khan Academy: Inscribed Angle Theorem Proof
Proving that an inscribed angle is half of a central angle that subtends the same arc.
Khan Academy
Khan Academy: Challenge Problems: Inscribed Angles
Solve two challenging problems that apply the inscribed angle theorem to find an arc measure or an arc length.
University of Georgia
University of Georgia: Inter Math: Inscribed Angle
This site gives a description of inscribed angles along with a visual representation. There are links to related terms, challenging problems, more information, and the interactive check point involving inscribed angles located in the...
Walter Fendt
Walter Fendt: Thales' Circle
A short interactive activity to prove that a triangle inscribed in a semicircle is right-angled.
Math Open Reference
Math Open Reference: Central Angle Theorem
Learn about the Central Angle Theorem with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Wolfram Research
Wolfram Math World: Inscribed Angle
This site provides not only a definition of inscribed angle but also links to related terms.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Proof the Inscribed Angle Theorem
Dr. Math gives a student a hint on how to prove that an inscribed angle is equal to 1/2 the central angle. You should know what the central angle and inscribed angle are to utilize this site.