Jawabanmu

2014-06-10T19:17:39+07:00
Sudut R = 180 - (120+30) = 30°
PR/sin Q = QR/sin P
6/sin 30 = QR/sin 120
QR = 6√3

L= 1/2 PR.QR.sin R = 1/2.6.6√3.1/2 = 9√3