Respuesta :

s^2 + s^2 = 9^2 => 2s^2 = 81 => s^2 = 81/2 => side length s = 9(sqrt(2))/2 = 6.37 cm.
HermioneNovak
Answer:

9cm

Explain:

If it’s a square all sides are equal. So if one side is 9cm all sides are 9cm

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