Blinded By The Maths

Fig A above shows the natural position of the foot at a right angle to the leg. In Fig B, the foot has been inserted into a shoe of heel height 'a'. In order for the leg to achieve the vertical position, the angle of adjustment, A, can be calculated using the formula:


                                                  sin A = a        (where 'c' = length of foot and 'a' = heel height)
                                                              c


Have I miscalculated? No matter - it's pretty evident to the naked eye. A woman wearing the above shoes, as shown below, would have to adjust her posture by approximately 35 degrees in order to stand vertical (ie: to look normal).