Cylinder, cone, rectangular prism, pyramid, sphere, or triangular prism are the ones i can choose for this but i chose cylinder

its 4 because 2 times 2 is 4, if you double the number two you get four

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.