Question

Find the length of the line segment that joins the points (2, 5) and (9, 8).

√10
√52
√58

Answer 1

Try drawing up a right-angle triangle, where the line you're looking for is the hypotenuse of the triangle. Using the lengths of the other two sides and pythagoras' theorem, you can work out the third side.
Alternatively, you can use the distance formula where
distance = SQR[(x2 - x1)^2 + (y2-y1)^2]

Answer 2

@Tommynaut ???