Question

The distance between the points $P(-1,1)$ and $Q(5,-7)$ is ........................

• A. $11$
• B. $10$
• C. $5$
• D. $7$

Answer 1

The correct option is B $10$

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

$=\sqrt{[5-(-1){]}^2+[-7-1{]}^2}$

$=\sqrt{6^2+8^2}$

$=\sqrt{100}=10$ units