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t=24 cm
s²=t²+r²=24²+7²=576+49=625
s=√625=25 cm
L=60 πrs
L=60×22/7×7×25
L=33.000 cm²
L=3,3 m²
Biaya = 3,3 × 50.000= Rp. 165.000
Jawaban B