Use the simplest rule you can find to calculate the next three terms of the following sequence

Does anyone know how to do geometryme with this problem

Through non-collinear points there is exactly one plane.

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?