Question

please give me answer

Answer 1

w.k.t.

tangents from a same point drawn to a circle are equal.

⇒PA=PB      ..................(1)

and AL=LM  ..................(2)

BN=MN        .................(3)

Now,

PL+AL=PA

PL+LM=PB   (from (2) (1))

⇒PL+LM=PN+BN

⇒PL+LM=PN+MN (from (3))

HENCE PROVED