@4buy @_eylem_99 @Mr_Etheridge23@ilarrosac@nabadvin @sergiosanz001 actually,the mid triangle( white) is 90-60-30, orange and red are similar.This should be easier.
@4buy @_eylem_99 @Mr_Etheridge23@ilarrosac@nabadvin @sergiosanz001 notice, red area's longest side is in a 120-30-30 triangle, and this 120-30-30 triangle's short side equal to ABC's side