efer to the orthophoto map 3.1 Calculate the gradient between 7 and 8 on the orthophoto map. Show ALL calculations. Marks will be awarded for this. (5 x 1) Vertical Interval (VI) Formula = Horizontal Equivalent (HE) 3.2 Provide map evidence to indicate that the gradient you calculated in QUESTION 1.2.1 is a gentle slope. (1 x 1) agnetic declination 1.1 Calculate the magnetic declination for 2021. Show ALL calculations Marks will be awarded for this. (5 x1 .2 Give TWO reasons why the calculation of the magnetic declination topographical maps are important. (2x​