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22/7 x 3.5 (3.5 + 12)
11 (15.5)
170,5 cm pangkat persegi
=√3,5²+12²
=√12.25+144
s=√156,25
s=12,5cm
Ls=π×r×s
=22/7×3,5×12,5
=137,5cm²