Jawabanmu

2014-09-07T14:30:58+07:00
R = y × cos60
r = 4 × 1/2
r = 2
dan
x = √4 pangakt 2 - 2 pangaka 2
x = √ 8 - 4
x = √ 4
x = 2
cos60 itu apa
lihat di opera deh . biar jalas kalau q nerangin ribet nanti