Resposta :
Tallyte,
Precisa determinar a distancia entre os pontos que são vértices do triangulo
(5,-2), (-2,7) e (3,4)
Distancia entre pontos
l = [(x2 - x1)^2 + (y2 - y1)^2]^1/2
a: (5,-2) (-2,7)
la = [(5 + 2)^2 + (-2 - 7)^2]^2 = (49 + 81)^1/2 = (130)^1/2
b: (3,4) (5,-2)
lb = [(3 - 5)^2 + (4 + 2)^2]^1/2 = (4 + 36)^1/2 = 4x10^1/2
c: (-2,7) (3,4)
lc = [(3 +2)^2 + (4 - 7)^2]^1/2 = (25 + 9)^1/2 = 34^1/2
Perímetro = la + lb + lc = [(130)^1/2 + 4x10^1/2 + (34)^1/2] unidades lineares