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Verified answer
K=4s72=4s
s=72/4
s=18
d=√(s^2+s^2)=√(2s^2)=s√2=18√2
Verified answer
Keliling = 4s72 cm = 4s
s = 72 cm / 4
s = 18 cm
s² + s² = diagonal²
18² + 18² = diagonal²
324 + 324 = diagonal²
648 = diagonal²
diagonal = √648
diagonal = √324√2
diagonal = 18 √2 cm