Question

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​

Answer 1

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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