In conventional high-heeled shoes, the heel is much higher than the rest of the shoe, causing the wearer to place their foot at an Angle.
传统的高跟鞋一般都是鞋跟部分要比鞋底高出很多，我们穿着的时候脚其实是位于一个三角形的支架上。
2
Foot&Leg health factor (or longevity factor) F2 consists of foot angle, foot heel depth and rear legs-rear view.
F2为肢蹄因子（或者称为长寿因子），它包括蹄角度、蹄踵深度和后肢侧视。
3
Using the mean draft, heelAngle and trim Angle as the design variables, it need not calculate tangent values of the angles and is more convenient for application.