https://en.m.wikipedia.org/wiki/Bottema%27s_theorem
https://en.m.wikipedia.org/wiki/Finsler%E2%80%93Hadwiger_theorem
https://www.facebook.com/share/p/RwfDa8k9wPGHSkEQ/?mibextid=TrneLp
https://www.facebook.com/share/p/e1vef9f8C1EFcFRv/?mibextid=TrneLp