EntityQ1147532· pop 28· linked from 13 articlesmissing square puzzleSign in to saveoptical illusion used in mathematicsConnectionsmathematicsEntityNew York CityCitytriangleEntityInternational Standard Book NumberEntityquadrilateralEntityparallelogramEntitytrigonometric functionEntityhypotenuseEntityslopeEntityoptical illusionEntitysimilarityEntityMartin GardnerEntityFibonacci sequenceEntityunit squareEntitychocolate barEntitySam LoydEntityPick's theoremEntityEinstellung effectEntitydissection puzzleEntitymissing dollar riddleEntityCategoriesElementary mathematicsFibonacci numbersGeometric dissectionMathematical paradoxesOptical illusionsRecreational mathematics