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What is the tangent theorem of a circle? (Mathematics in Grade Three)
Definition of chord tangent angle:

The angle at which the vertex is on the circle and one side intersects the circle and the other side is tangent to the circle is called the tangent angle.

1. Chord Angle Theorem

Definition of tangent angle: the angle whose vertex is on the circle, one side intersects with the circle and the other side is tangent to the circle is called tangent angle.