14) Which method of contouring is most accurate but slow and tedious?

15) Which method of interpolation is rapid, approximate result and used for small scale map?

16) Which method of interpolation of contour is laborious, tedious but most accurate?

17) What is the process of placing the contour lines proportionally between the plotted ground point is?

18) What is the distance between A and 42 m contour given that the distance between A and B is 10m and have reduced levels 41.3 and 43.8 m, contour interval 1m?