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Sisi A-B = ( Luas ÷ ÷ Tinggi ) - Panjang Sisi Atas
= ( 192 ÷ ÷ 12 ) - 7
= ( 192 × ÷ 12 ) - 7
= ( 384 ÷ 12 ) - 7
= 32 - 7
= 25 Cm