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dalam = jari2 di tambah
luar = jari2 di kurang
jadi cara cepat nya harus wajib hafal triple pytagoras
ra+rb = 6
ada angka 6 ,.., 10
jadi tengah nya kan 8
hasil nya 8 cm
contoh triple pytagoras
3,4,5
6,8,10
5,12,13
7,24,25
jadi g perlu rumus2 an lagi deh .. di kira2 aja dah bisa