Jawabanmu

2014-05-24T13:35:42+07:00
S = 1/2 (5+5+8) = 9 L segitiga = (a . t) 1/2 = (8 . 3 ) 1/2 = 12 r = L/s = 12 / 9 = 1,33 cm. Maaf, kalo salah.