Penanda sudut

\pic[draw=orange-red,angle radius=7mm,pic text=$\alpha^\circ$,pic text options={font=\scriptsize,yshift=.1mm},angle eccentricity=.75] {angle={B--A--C}};
\pic[draw=orange-red,angle radius=5mm,pic text=$75^\circ$,pic text options={font=\scriptsize,shift={(-.5mm,.1mm)}},angle eccentricity=.75] {angle={F--E--C}};
\pic[draw=orange-red,angle radius=3.5mm,pic text=$x^\circ$,pic text options={font=\scriptsize,shift={(.8mm,.5mm)}},angle eccentricity=.35] {angle={B--F--E}};
\pic[angle radius=5mm,pic text=$2\alpha^\circ$,pic text options={font=\scriptsize,shift={(1mm,0mm)}},angle eccentricity=.75] {angle={F--D--E}};