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u6 =ar^5 = 96
u6/u1 = ar^5/a
96/3 = r^5
32 = r^5
r = 2
S6 = 3(2^6 - 1) / (2-1)
= 3(64 - 1) /1
= 3(63)
= 189
Jadi luasnya 189 m2