How to distinguish a pentagon from a quadrangle?

To distinguish between a five-and-five-point figure and a four-and-six-point figure, we can judge by observing the relative position of the wrist and the thigh root. The following are the details:

1, a 50-50 number. When you stand up straight, your arms naturally hang down at your sides. If your wrist is facing the root of your thigh, it is a quintile. This does not mean that the ratio of upper body to lower body must be 1: 1. As long as it is close to this ratio, it can be considered as a quintile.

Two, four or six points. It can be judged by calculating the body proportion, and the formula is (umbilical height-height) × 100. This method can only get a rough numerical value. To get more accurate leg-to-body ratio, we need to use Mahalanobis trunk leg length index, the calculation method is (height-sitting height) × 100, and Mahalanobis index is 80.