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80×50= 400
216000÷4000= 54
54 = x
jadi tingginya adalah 54
16. a. l kubus+lkerucut = 5×16² + 17×16×2 = 1280+ 544 = 1824
b. Vkubus + Vkerucut= 16³ + 1/3×16²+15 = 4096+1280 = 5376