Jawabanmu

2014-03-02T21:52:01+07:00
Keliling = 8+9+√145=29,04

luas =  \sqrt{s(s-a)(s-b)(s-c)}
s = K/2=14,52
L =  \sqrt{14,52*6,52*5,52*2,48} =35,9999=36

r=L/s
=35,99/14,52
=2,48