Question 465591
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Hi,
Note: Perimeter is the length found by adding the lengths of all sides.
Let x represent the length of each congruent side. Note: 2x = base/2  + 12
and therefore the base is 2(2x -12) 
 Question states*** P = 36cm
 x + x + 2(2x-12) = 36
        6x = 60
         x = 10, length of each congruent side.  Base is 16.    2*(30-12)

CHECKING our Answer***
   10cm + 10cm + 16cm = 36cm