Odpowiedzi

2009-12-02T16:30:00+01:00
A= (-4,3)
B= (2,-2)
C= (2,3)

AB = [6,-5]
|AB|=√6²+(-5)²
|AB|=√36+25
|AB|=√61

AC=[6,0]
|AC|=√6²+0²
|AC|=√36
|AC|=6

BC=[0,5]
|BC|=√0²+5²
|BC|=√25
|BC|=5

obw= 5+6+√61 = 11+√61
4 3 4
2009-12-02T16:37:22+01:00
|AB|=√₆₁≈7,8
|AC|=√₃₆=6
|BC|=√₂₅=5
obw.=7,8+6+5=18,8
1 1 1