Distance between points in first quadrant

Problem

Plot the points left parenthesis, 2, comma, 1, right parenthesis and left parenthesis, 5, comma, 1, right parenthesis on the coordinate plane below.
What is the distance between these two points?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, p, i or 2, slash, 3, space, p, i
units