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Sehingga, panjang kedua diagonal tersebut :
d2 = 4x
L = 24 cm²
L = 1/2 x d1 x d2
24 = 1/2 x 3x x 4x
24 = 1/2 x 12x²
24 : 1/2 = 12x²
24 x 2/1 = 12x²
48 = 12x²
x² = 48/12
x² = 4
x = √4
x = 2
Diagonal 1 = 3x = 3(2) = 6 cm
Diagonal 2 = 4x = 4(2) = 8 cm