Mathematics

Problem

From an external point

P

, two tangents

PA

and

PB

are drawn to a circle. If

PA = 9\,\text{cm}

and the chord

AB

12\,\text{cm}

long, what is the perimeter of

\triangle PAB

? a)

27\text{ cm}

30\text{ cm}

24\text{ cm}

18\text{ cm}