Question

find the length of the tangent dron point p 12cm away. form a centre of circle if radius 5cm

Answer 1

Let's think the length of the tangent is x

Then,

x^2=(12)^2-(5^2)

or, x^2=144-25

or,x=√119

or,x=10.9

The length is 10.9cm.

Answer 2

given radius =r= 5cm
let length of the tangent = l cm==12cm
doistance from the point to center = d
d^2= l^2+r^2
=(12)^2+ 5^2
=144+25
=169
d= 13 cm