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Difficulty: HardPuzzle Details

Puzzle IconWhat shape completes the bottom line?

triangle pentagon square
square hexagon hexagon square
pentagon hexagon hexagon hexagon square triangle
hexagon octagon octagon octagon octagon ==?==

Show Hint Show Answer Print Puzzle
[Ref: ZGOE] © Kevin Stone 

Answer: Square.

Square the first shape's sides and the remaining shapes add up to this number.

E.g.

   triangle pentagon square
      >> 3x3 = 5 + 4
   square hexagon hexagon square
      >> 4x4 = 6 + 6 + 4

Therefore:

   hexagon octagon octagon octagon octagon square
      >> 6x6 = 8 + 8 + 8 + 8 + 4


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