fis1x = $x=\frac{\sum_{i=1}^3 x_i m_i}{\sum_{i=1}^3m_i}$;
fis1y = $y=\frac{\sum_{i=1}^3 y_{i} m_i}{\sum_{i=1}^3m_i}$;

fis2x = $v_x=\frac{\sum_{i=1}^3 v_{xi} m_i}{\sum_{i=1}^3m_i}$ ;
fis2y = $v_y=\frac{\sum_{i=1}^3 v_{yi} m_i}{\sum_{i=1}^3m_i}$ ;

fis3x = $p_x=\sum_{i=1}^3 v_{xi} m_i$ ;
fis3y = $p_y=\sum_{i=1}^3 v_{yi} m_i$ ;

fis4 = $L_z=\sum_{i=1}^3 m_i(x_iv_{yi}-y_iv_{xi})$;

fis5 = $T=\frac{1}{2}\sum_{i=1}^3 m_i(v_{xi}^2+v_{yi}^2)$;

fis6 = $T_c=\frac{1}{2}\left(\sum_{i=1}^3m_i\right)\left(\frac{\sum_{i=1}^3 v_{xi} m_i}{\sum_{i=1}^3m_i}\right)^2$;