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=1/2. 82
= 41 cm
L = akar s (s-a) (s-b) (s-c)
= akar 41 (41-23) (41-27) (41-32)
= akar 41 . 18. 14. 9
= akar 41. 9.2.2.7.9
= 18 akar 287
r = L/s = 18 akar 287 / 41