[tex]\bf ~~~~~~~~~~~~\textit{middle point of 2 points } \\\\ E(\stackrel{x_1}{2t}~,~\stackrel{y_1}{0})\qquad C(\stackrel{x_2}{2p}~,~\stackrel{y_2}{2r}) \qquad \left(\cfrac{ x_2 + x_1}{2}~~~ ,~~~ \cfrac{ y_2 + y_1}{2} \right) \\\\\\ \left( \cfrac{2p+2t}{2}~~,~~\cfrac{2r+0}{2} \right)\implies \left( \cfrac{2(p+t)}{2}~,~\cfrac{2r}{2} \right)\implies (p+t~~,~~r)[/tex]
