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L persegi panjang = 32 cm * 21 cm
L persegi panjang = 672 cm^2
L layang-layang = 1/2 * d1 * d2
672 cm^2 = 1/2 * 24 cm * d2
672 cm^2 = 12 cm * d2
d2 = 672 cm^2 : 12 cm
d2 = 56 cm
selisih = 56 cm - 24 cm
selisih = 32 cm
Jadi, selisihnya adalah 32 cm