Jawabanmu

2014-06-10T09:16:21+07:00
X=r cos α
x=8 cos 45
x = 8. (√2/2)
x=4√2

y=r sin α
y=8 sin 45
y=8. (√2/2)
y= 4√2

jadi koordinat cartesiusnya (x,y)=(4√2 ,4√2)