Hi,

 What is the length of the base (2s - 4)?

  36 = s + s + 2s - 4

 36 = 4s - 4             |Solving for s

 40 = 4s

 10 = s   and the base is 16   

CHECKING our answer***

36 = 10 + 10 + 16 = 36 

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