Jawabanmu

2014-05-25T16:16:00+07:00
P:Q:R=5x:8x:3x
5x+8x+3x=180
16x=180
x=11,25°

P=5x=5.11,25=56,25°
Q=8x=8.11,25=90°
R=3x=3.11,25=33,75°
2014-05-25T16:42:40+07:00
Saya cuma mengetahui Q=90° dan R = 33,75°