Question

What is the distance between P(12, 11) and Q(5, 1)?

Answer 1

For two points, say A(x\(_1\),y\(_1\)) and B(x\(_2\),y\(_2\)), the distance AB between them is:
\[AB = \sqrt{(x_1-x_2)^2 + (y_1-y_2)^2}\]

Use this for P and Q in your case, can you?