Resposta :
a) A (-1,2) , B (0,4).
Dab= V(4-2)^2+(0+1)^2
V4+1
V5
Mabb= x1+x2 = 0 -1 = - 1 ; y1 +y2 = -1-3 = - 2
2 2 2 2 2
b) C (2,-2), D (3,-3).
Dab= V(-3+2)^2+(3-2)^2
V1+1
V2
Mabb= x1+x2 = 2 +3 = 5 ; y1 +y2 = -2-3 = - 5
2 2 2 2 2 2
Dab= V(4-2)^2+(0+1)^2
V4+1
V5
Mabb= x1+x2 = 0 -1 = - 1 ; y1 +y2 = -1-3 = - 2
2 2 2 2 2
b) C (2,-2), D (3,-3).
Dab= V(-3+2)^2+(3-2)^2
V1+1
V2
Mabb= x1+x2 = 2 +3 = 5 ; y1 +y2 = -2-3 = - 5
2 2 2 2 2 2