Question

Find the distance between the points (-1, 5), (2, 1) [2 MARKS]

Answer 1

Concept : 1 Mark
Application : 1 Mark

Distance between points $A(x_1,y_1)$ and $B(x_2,y_2)$ is,

$D=\sqrt{{(x_2-x_1)}^2+{(y_2-y_1)}^2}$

$D=\sqrt{{(2-(-1\left)\right)}^2+{(1-5)}^2}$

$D=\sqrt{{(2+1)}^2+{(-4)}^2}$

$D=\sqrt{9+16}$

$D=\sqrt{25}$

$D=5units$