- Inscribed Angle and Central Angle A dynamic diagram to illustrate the angle in a semicircle (www.ies.co.jp)
- Circle
Geometry (Inscribed and Central angles) Fully interactive diagram useful for angle in a
semi-circle Java (by Ron Blond)
- Circle
Geometry (Tangents and Radii) Fully
interactive Tangent Kite diagram and chord/
midpoint/ perpendicular diagram Java (by Ron Blond)
- Area
of Sector Interactive demo with sliders for
radius and angle Flash (thesaurus.maths.org)
- Angle
at Centre Interactive demo Flash (thesaurus.maths.org)
- Triangle Classification Has the facility to show dynamically triangles in a semicircle with side and angle measurements (illuminations.nctm.org)
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