What is the square root of 4

The triangles are similar. what is the value of x? x=

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?