Question

Calcule a distância entre os pontos
A (1,9) e B (2,8)

Answer 1

d² = (x₂ - x₁)²  + (y₂ - y₁)²
d² = (2-1)² + (8-9)²
d² = (1)² + (-1)²
d = √ 1 + 1 
d = √2

Answer 2

d= √(x2 -x1)^2. + (y2-y1)^2

d= √(2-1)^2 + (8-9)^2

d= √1^2+(-1)^2

d= √1+1

d= √2