A point P is 10 cm from the centre of a circle. The length of tangent drawn from P to the circle
is 8cm, the radius of the circle is equal to
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let the center of circle be O
distance from center to point P is 10 cm
length of tangent PT is 8 cm
the radius is OT be r
tangent make 90° at point of contact with the radius
we get a right angle triangle OPT
by using Pythagoras theorem
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