Define isometry; direct isometry; opposite isometry. you

Isometry - distance preserving injective map between metric spaces
Direct Isometry - orientation is preserved - the order of the lettering in the figure. and the image are the same , either both clockwise or both counterclockwise.
Opposite Isometry - orientation is not preserved - the order of the lettering is reserved , either clockwise becomes counterclockwise or counterclockwise becomes clockwise. Line Reflection

It equals 1373.5 that’s the solution