Interactive Version of Theorem 19 (Corollary 2)

Theorem: Two angles in a circle standing on the same arc are equal

Theorem 19 (Corollary 2) : All angles at a point of a circle, standing on the same arc are equal.

Instructions: Move the angles on the arc using your mouse, noting that they always remain equal when they are on the same arc.

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GeoGebra diagram created by Ms.McCarthy.

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