Which number or numbers have 2 lines of symm

Can someone explain to me how to do

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?

What rule describes a dilation with a scale factor of 4 and the center of dilation at the origin?