Prove that line drawn from centre to the point of contact of a tangent is perpendicular to it

Prove that line drawn from centre to the point of contact of a tangent

1.	Prove that line drawn from centre to the point of contact of a tangent is perpendicular to it
Answer» 1.Join center to that point from the tangent are drawn and prove both triangle congruent.2.By SAS congruence Tangents drawn from an external points to a circle is perpendicular to the radius Perpendicular is equal to the tangents