Question

the length of tangent from a point A at a distance 5cm from the centre of. a circle is 4cm the rafius of circle is​

Answer 1

take this situation as a rt triangle

because radius to the point of contact of a tangent forms 90degree .

then according to Pythagoras theorem

5square= 4square + x

25 =16 +x

x= 25-16

=9

therefore radius of circle is 3cm

because √9=3