Math: Geometry: What's New, Recent Additions, College, High School, Kids - Page 116

Proposed Problem 78: Angles of a Circle. Perpendicular and parallel lines, Midpoint, Diameter, Chord, Cyclic quadrilateral, Congruence.

K-12 Teaching and Learning from the University of North Carolina at Chapel Hill School of Education.
March 2008.

GoGeometry has been cataloged in the Best of the Web collection by LEARN NC. LEARN NC's Best of the Web collection provides a searchable, annotated catalog of top-quality educational websites, all tied to the North Carolina Standard Course of Study.
LEARN NORTH CAROLINA, a program of the University of North Carolina at Chapel Hill School of Education, is a statewide network of educators using the power of the Internet to improve K–12 education in North Carolina

Proposed Problem 77: Angles of a Circle. Parallel lines, Cyclic quadrilateral.

I have used Geometry Expressions, the world's first Interactive Symbolic Geometry System, to visualize the Archimedean Twins and check out a variety of conjectures.

Plaza in Sechin, Ancash, Peru may be the America's oldest urban site
The circular structure at the ruins of Sechin Bajo is about 5,500 years old, archaeologists report.

Proposed Problem 76: Area of a Circle. Square, Circle, Circular Sector.

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