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54=½×a×12
54=6×a
9=a
Hipotenusa>> 15 cm (tripel pythagoras)
r=abc per 4L
r=9×12×15 per 4×54 (coret yang bisa dicoret/?:v)
sampe ujungnya ketemu dgn
⬇⬇
r=15 per 2
r=7½ cm
:v