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panjang = 2x
keliling = panjang + lebar + panjang + lebar
54 = x + x + 2x + 2x
54 = 6x
x = 9
lebar = 9
panjang = 9 x 2 = 18
diagonal^2 = lebar^2 + panjang^2
= 81 + 324
= 405
diagonal = V405
^2 = pangkat 2
V = akar