A body moves 6m north. 8m east and 10m vertically upwards,what is it's resultant displacement from initial positon

When you travel 6m North and 8m East, in 2 dimensions the resultant vector by Pythagoras theorem is 10m.

From that point it travels 10m upwards which again forms a right angle triangle in a different plan from the resultant vector whose magnitude is also 10m

Therefore again applying Pythagoras theorem, root of 10^2 + 10^2 = 10xsqrt(2)