Age 7 to 16
Try some substitution for different values of N and see how this helps you to draw different polygons.
Try N = 3. Why isn't the answer 60, which is the size of the angle of an equilateral triangle?
N.B. As you walk around any polygon what is the total angle you will always turn through no matter what the size of the polygon?
360 degrees - which is the sum of the external, not the interal angles.
What is the RT 360/:N doing in the procedure?