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L.juring / 3,14*6*6 = 60 / 360
L.juring / 113,04 = 1 / 6
L.juring * 6 = 113,04
L.juring = 113,04 / 6
L.jring = 18,84
untuk soal b dan c harus diketahui panjang alas segitiga dan apotemanya