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luas permukaan (LP)
volume (v)
maka
sehingga
L.permukaan = 2 (pxl + pxt + lxt)
900 = 2 ( 15x10 + 15xt + 10xt)
900 = 2 ( 150 + 15t + 10t)
900 = 2 ( 150 + 25t)
900 = 300 + 50t
900-300 = 50t
600/50 = tinggi
12 = tinggi
volum = p xl x t
= 15 x 10 x 12
= 1800 cm³