Cross five

The figure on the picture is composed of the same squares and has a content of 45cm². What's its perimeter?

Correct result:

o =  36 cm

Solution:

S=45 cm2 S1=S/5=45/5=9 cm2  S1=a2 a=S1=9=3 cm  o=4⋅ 3⋅ a=4⋅ 3⋅ 3=36 cm

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