Question

Given a circle with centre O, Q is a point in the exterior such that OQ =2.5cm and the length of the tangent from Q to the circle is 2cm. Find the radius of circle

Answer 1

Let AP be a tangent drawn from P to a circle with centre O such that AP = 24 cm and OB = 25 cm.

In right angled △ OAB,

OP2=OA2+AP2

252=OA2+242

OA2=49

OA=7 cm

Hence, the radius of circle is 7 cm.

Answer 2

Answer:

I need answer with explanation