Beachte: Die Skizze ist nicht maßstabsgetreu.

Für den Mittelpunkt $\text{M}(x_M\mathrm{\mid }{y}_M)\backslash text\{M\}(x\_M|y\_M)$ gilt: $x_M={\displaystyle \frac{1}{2}}\cdot (x_A+x_B)x\_M\backslash \; =\backslash \; \backslash dfrac\{1\}\{2\}\backslash cdot(x\_A\; +\; x\_B)$ und $y_M={\displaystyle \frac{1}{2}}\cdot (y_A+y_B)y\_M\backslash \; =\backslash \; \backslash dfrac\{1\}\{2\}\backslash cdot(y\_A\; +\; y\_B)$

$x_M={\displaystyle \frac{1}{2}}\cdot (50+4)\Rightarrow x_M=27x\_M\backslash \; =\backslash \; \backslash dfrac\{1\}\{2\}\backslash cdot(50\; +\; 4)\backslash \; \backslash Rightarrow\backslash \; x\_M\backslash \; =\backslash \; 27$

$y_M={\displaystyle \frac{1}{2}}\cdot (3+80)\Rightarrow y_M=\mathrm{41,5}y\_M\backslash \; =\backslash \; \backslash dfrac\{1\}\{2\}\backslash cdot(3\; +\; 80)\backslash \; \backslash Rightarrow\backslash \; y\_M\backslash \; =\backslash \; 41\{,\}5$

$M(27\mathrm{\mid }\mathrm{41,5})M(27|41\{,\}5)$