You are given that the following set of statements are true. (a) if an integer is even, then it is cosmological. (b) if a real number is cosmological, then it is not mystical. (c) if two real numbers are not mystical, then their product is mystical. provide a proof by contradiction for the following statement: it is true that at least one of v2 or 18 is mystical.

18 is even, so by rule (a) cosmological, let's call it C. 18 is real and C and so by (b) not mystical, not M.  

So V2 which I guess is is our only hope.

Assume is not M.

Then is M, as by (c) it's the product of two not M numbers.

2 is even, so 2 is C (rule (a)).  So 2 is not M (rule (b)).  That's a contradiction.

Therefore our assumption is false.  We conclude

is mystical.

One obvious difference is the Sierra constructing a square and Keaton is constructing a Hexagon. From there, we can determine the other differences. Constructing inscribed polygons requires determining the central angle by dividing 360 degrees by a certain whole number. For regular polygons, this number is equal to the number of sides. For squares, the central angle is 360/4 = 90 degrees while for hexagon, the central angle is 360/6 = 60 degrees.