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84=1/3.21.t
84=7t
12=t
20)Cari tingginya dulu
dr²=p²+l²+t²
5√10=p²+5²+6²
235=p²+25+36
235-25-36=p²
174=p²
13√5=p
t=13√5 cm
V=La.t
=(5.6.1/2).13√5
=15.13√5
=195√5 cm³