Angle Formed by Chord & Tangent (I)

[color=#000000]In the circle in the applet below, the [/color][b][color=#ff00ff]angle[/color][/b][color=#000000] is said to be an [/color][b][color=#ff00ff]angle formed by a chord and a tangent[/color][/b][color=#000000]. [/color]
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Information: Angle Formed by Chord & Tangent (I)