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s = 1/2 × (16+30+34)
s = 1/2 × 80
s = 40 cm
L = √[s . (s-a) . (s-b) . (s-c)]
L = √[40 . (40-16) . (40-30) . (40-34)]
L = √(40 . 24 . 10 . 6)
L = √57600
L = 240 cm²
r = (abc)/(4L)
r = (16 . 30 . 34)/(4 . 240)
r = 16320/960
r = 17 cm
K lingkaran luar
= 2πr
= 2 . 3,14 . 17
= 106,76 cm