40) How to check the triangle plotting?

41) What instrument is used to prepare curved lines for inking the map?

42) What colour is used for barren land in the drawing?

43) What is the true length measured with an incorrect 20 m chain of actually 20.02 m long for a measured length of 500 M?

44) What is the true distance between two points?
Measured distance = 720 m.
Length of chain = 20 m.
Error in chain = (+) 40 cm.