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IABI=V[(2-(-1))^2+(6-2)^2
IABI=V[(2+1)^2+4^2] = V(3^2+16)=V(9+16)=V25=5
AB=5 j.
P=a^2
P=5^2
P=25 j^2
Odp.C
zad.2.
Xs=(Xp+Xq)/2 II*2
2Xs=Xp+Xq
Xp=2Xs-Xq
Xp=2*(-4)-17=-8-17=-25
Ys=(Yp+Yq)/2 II*2
2Ys=Yp+Yq
Yp=2Ys-Yq
Yp=2*7-12=14-12=2
P=(-25,2)
Odp.C