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In a circle, any inscribed angle subtended by a chord of a given length is constant. A good demonstration is to justapose as text multiple angles subtended by a common chord. This model comprises a circle and two pairs of lines that represent two angles and share a common subtending chord. Showing both of those angles together demonstrates this simple geometric theorem. Text is perhaps the most simple Reporter. Sometimes it is actually effective.      ... more on Design Patterns CA

RepoSubtendedAngle Manipulations

RepoSubtendedAngle Manipulations