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a= 4 satuan
b=4 satuan
r=5 satuan
α=...?
r²=a²+b²+2.a.b.cosα
5²=4²+4²+2.4.4.cosα
25=32+32 cosα
cosa=7/-32= -0,21875
a=257°
vektor b = 4 satuan
R = 5 satuan
sudut yg diapit?
R= √4².4²+2.4.4.cos a
5=√16.16 + 32 cos a
5²= 16.16 + 32cos a
25= 256 + 32 cos a
-32 cos a = 256-25
-32 cos a = 231
32 cos a = -231
cos a = -231/32