1.
v{1,-9}
||v||=√1+81=√82
u=(1/√82,-9/√82)
||u||=1+81/82=82/82=1
2.
a=2.5
b=1.9
c=0.8
c^2=a^2+b^2-2abcosC
C=13.95⁰
a/sin A=c/sinC
A=48.88⁰
B=180⁰-(13.95⁰+48.88⁰)=117.17⁰
3.
a=5.5
b=14.7
c=11
s=a+b+c/2=15.6
A=√s(s-a)(s-b)(s-c)
√15.6*10.1*0.9*4.6=25.54
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