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OpenStudy (anonymous):
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OpenStudy (anonymous):
OpenStudy (anonymous):
Use the pythagoras theorem to find the sides of the square from the length of the diagonal. Pythagoras theorem: [length ^{2}+width ^{2}=diagonal ^{2}\] ,since the shape is a square , length=width therefore ,2width ^{2}=13^{2} , width=sqrt{13^{2}/2}=9.19. perimeter =width*4=36.8
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