The tangent at any point of a circle is perpendicular to the radius through the point of contact.
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GIVEN:- a circle with the center 'O' with tangent XY at the point of contact P.
TO PROVE:- OP perpendicular to XY.
PROOF :- let Q be point on XY join OQ suppose it touches the circle at 'R'
HENCE , OQ >OR [OP = OR RADIUS]
OQ > OP
hence , OP is the smallest line that connects XY and smallest line is perpendicular.
THEREFORE :- OPis perpendicular to XY✔
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