Question

What is the distance between points P(0, 4) and Q(3, 0)?

Answer 1

$PQ= \sqrt{(x_p-x_q)^2+(y_p-y_q)^2}= \sqrt{(0-3)^2+(4-0)^2} = \\ \\ = \sqrt{(-3)^2+4^2}= \sqrt{9+16}= \sqrt{25}=5$

Answer: 5