It is the point at which a tangent touches a curve.
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Perpendicular
perpendicular
Definition: a tangent is a line that intersects a circle at exactly one point, the point of intersection is the point of contact or the point of tangency. a tangent is a line that intersects a circle at exactly one point, the point of intersection is the (point of contact) or the **point of tangency**.
90 degrees. QED.
4/9*pi*r where r is the radius of the circle.