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Panjang balok : 15 cm
Lebar balok : 4 cm
Luas permukaan : 500 cm^2
Ditanyakan :
Hitunglah tinggi balok ...?
Jawab :
L = 2 (pl + pt + lt)
500 = 2 (15 × 4 + 15 × t + 4 × t)
250 = 60 + 15t + 4t
190 = 19t
t = 10
Jadi, tinggi balok adalah 10 cm.