That's why the radius is perpendicular to the tangent

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In this video I will tell you why the radius of this circle drawn to the point of contact with the tangent is perpendicular to it. Hope you enjoyed the video and learned something new :)
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The assumption, that the shortest connection from a point to a line meets the line in a right angle is not a definition but must be proven. So, this is bad explanation for young pupils.

Neilcourtwalker