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d1 = d2
5x = 3x+8
5x-3x = 8
2x = 8
x = 8/2
x = 4
5x = 5.4 = 20 cm
jadi panjang diagonalnya adalah 20 cm
5x = 3x+8
5x-3x = 8
2x = 8
x = 8/2
x = 4
jadi, d1 = 5x = 5.4 = 20 cm
dan d2 = 3x+8 = 3.4+8 = 12+8 = 20 cm