Apzīmējot ar s1 trajektoriju priekšējam ratam kontaktpunktā B un apzīmējot ar ds1 trajektorijas elementu, tad elements ds1 ar z- un y-asi veido kosinusa leņķi
With s1 representing the path to the front wheel contact point (B) and identifying with ds1 path element, then the element with z-ds1 and y-axis represents the cosine of the angle
Describe a path s1 with the front wheel contact point B and being known as DS1 path element, then the element ds1 with z and y-axis consists of cosine angle