Answer:
The answer to the question is, 36 meters
Explanation:
( P.S There is no meaning in giving a giant explanation so I kept it short just for you to understand )
P = 2( L+W )
= 2( 12m + 6m )
= 2( 18m )
= 36m
( m = meters )
Thus the answer to your problem is, 36 meters