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Ob =-1,4+2,3+1+(-3)+(-2,2)
Ob= -3,3
Obliczenie odcinków:
a) |AB|
1²+3²=|AB|²
1+9=|AB|²
10=|AB|² /√
|AB|=√10
b) |BC|
6²+1²=|BC|²
36+1=|BC|²
37=|BC|² /√
|BC|=√37
c) |CD|
5²+3²=|CD|²
25+9=|CD|²
34=|CD|² /√
|CD|=√34
d) |DA|
1²+2²=|DA|²
1+4=|DA|² /√
|DA|=√5
OB=√10+√37+√34+√5=√86