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|AS|=1/2 d=1/2*a√2
|AS|²=(2+1)²+(5-2)²=9+9=18
|AS|=3√2
d=6√2
a=6
Ob=4*6=24
Odp. D
13.
a1*a2=-1
2(2-m)=-1/:2
2-m=-1/2
-m=-1/2-2
m=2,5
Odp. C