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30
60
90
120

30?

|dw:1355413599643:dw|

its those but in a row

then the perimeter will be just 5*(3*5)
5 equilateral triangles, each with perimeter (3*5)

15

there is 6 of those triangles

dont forget there is 6 of those triangles

75 is not in options...ohh 6!
then 6*(3*5) = 90

yes!