Jawabanmu

2014-04-11T19:49:36+07:00
L segitiga= 1/2(12x16)
 => 96 cm²

s=√12²+16²
s=√144+256
s=√400
s=20
keliling segitiga =12+16+s
keliling segitiga = 12+16+20 =48

r=L segitiga/ 1/2(k.segitiga)
r = 96/ 1/2(48)
r = 96/24
r = 4

L lingkarang = πr² = 3,14(4)² =50,24