Question

the length of a tangent from a point A at distance 5cm from the center of the circle is 4 cm find radius​

Answer 1

Step-by-step explanation:

AO is perpendicular to OP ( tanget is always perpendicular to line joining by centre)

A

hence, by Pythagoras thereom

OP^2=AP^2+AO^2

AO^2=OP^2-AP^2

=5^2-4^2

=25-16

=9

AO=√9

AO=3

r=3cm