(i) The tangent at any point of a circle is perpendicular to the radius through the point of contact.
(ii) A circle may have two parallel tangents
(iii) A tangent to a circle intersects it in one point.
(iv) Secant is a line intersecting a circle in two points
(v) The angle between tangent at a point on a circle and the radius through the point is 90°
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