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s = 1/2 . (a + b + c)
= 1/2. ( 16 + 30 + 34)
= 1/2 . 80 = 40
L. segitiga = √s (s-a)(s-b)(s-c)
= √40 (40-16)(40-30)(40-34)
= √40.24.10.6
= √57600 = 240
r = a.b.c / 4. L. Segitiga
= 16.30.34/4.240 = 17
Keliling = 2.π.r
= 2 x 3,14 x 17 = 106,70