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312= jumlah a+b × 16 ÷2
312=jumlah a+b × 8
312÷8=jumlah a+b
39=jumlah a+b
39-24=15,jawabannya 15
= (2 x 312 cm²) : 16 cm - 24 cm
= 624 cm² : 16 cm - 24 cm
= 39 cm - 24 cm
= 15 cm
Jadi, panjang sisi lain adalah 15 cm