Mathematics

Problem

Two concentric circles with common centre

O

have radii

6\,\text{cm}

and

8\,\text{cm}

. From an external point

P

, tangents

PA

and

PB

are drawn to the smaller and larger circle respectively. If

PA=8\,\text{cm}

, then

PB

equals a)

8\,\text{cm}

10\,\text{cm}

6\,\text{cm}

5.3\,\text{cm}