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Topmadworld
Hey there,
I am just going to assume that each block is 1 cm.
So, you just have to count the outer surface of the figure, which is...
1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1 = 18 cm

Hope this helps ^_^

~Top
Calniz
The correct answer should be 18 m.
I hope this helps.
YOU'RE WELCOME :D