The using of The Tang-Lang language
     I had to suit two maps. So the accurancy only 1-2 digit. This is on my map only 0.5 mm.
     But we  can verify the determination.  The question is can we build such a triangle or not,
     because two angles determinate the third.
     We can find crater arcs to help the recognise of angles. (Fesenkov, Uranius Patera)
 
 
 
   

These are angle-keeping type of maps.
 
          Tg(50.97°)=1.234                                 Tg(72.34°)=3.14
 
Tg(56.79)=1.52 
Tg(56.73)=1.524 

Tg(72.34)=3.14 
Tg(50.97)=1.234 
 
 
 
 
 
 
 
 

Tg(33.27°)=0.656=1/1.524 

Tg(21.15°)=0.386 
 
 
 
 
            And now let we see the angles at the enormous volcans of Pavonis Mons and Arsia
             Mons.
 
 
 
 

The Pavonis Mons (up), the Arsia Mons (down), The small Biblis Patera (56.72°) and the Ulysses Patera (45°). 
The NG+ object, 33.27°
 
           My measuring has first 2 digit accurancy only. But the intent clear.
 
 
 
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