Jawabanmu

2014-09-05T21:59:35+07:00
Dik 
A = 10 km
B = 2 m
α = 30

R^2 = A^2 + B^2 + 2.A.B. Cos 30
R^2 =  10^ 2  + 2^2 + 2.10 .2 . 0.87
R^2 = 100 + 4 + 34,8
R^2 = 138,8
R =  \sqrt{138,8}  = 11,78 satuan

semoga membantu ^_^
2014-09-05T22:16:46+07:00
Dik : a=10
b=2 m = 0.002
alpa= 30°

R'2 = A'2 + B'2 +2AB × Cos 30
=100+900+2(10)(30) 1/2 akar 3
=1600 × 1/2 akar 3
=800 akar 3