If a machine has 100% efficiency, it means that output work is equal to input work.
output force is equal to input force.
output work is twice the input work.
output force is twice the input force.

1

Step-by-step explanation:

output work is equal to input work

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.