If a line intersects a circle to be perpendicular to the radius at that point, then it is tangent to the circle, and so does not intersect the circle anywhere else. We prove this result in today's geometry video lesson. Recall that the converse is true as well. That is, if a line is tangent to a circle, then it is perpendicular to the radius at the point of tangency. We'll use a fun proof by contradiction for today's proof! #Geometry
Proof Radius is Perpendicular to Tangent Line: [ Ссылка ]
Proof of Isosceles Triangle Theorem: [ Ссылка ]
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