In the US, we call this orthographic projection. Surprised you didn't notice the errors about the angular face. 1)You used 3 dimensions to define this feature when only 2 are sufficient. The 3rd dimension is redundant and therefore never used in technical drawing unless one of the dimensions is labeled "REF." for reference. 2)The left face + the height of the angular feature = 55mm, whereas you have the overall height dimensioned at 50mm. If you omitted the 35mm dim. the drawing would be almost ok - at least you could make a finished drawing or part from it . Also, we generally don't dimension to hidden lines, regardless of leader lines; and if we dimension to the edge of an angular face, we usually annote it with "TSC", meaning 'to sharp corner'.
