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  2. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The apparent triangles formed from the figures are 13 units wide and 5 units tall, so it appears that the area should be S = ⁠ 13×5 / 2 ⁠ = 32.5 units. However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent. With the bent ...

  3. Hooper's paradox - Wikipedia

    en.wikipedia.org/wiki/Hooper's_paradox

    Hooper's paradox is a falsidical paradox based on an optical illusion. A geometric shape with an area of 32 units is dissected into four parts, which afterwards get assembled into a rectangle with an area of only 30 units.

  4. Missing dollar riddle - Wikipedia

    en.wikipedia.org/wiki/Missing_dollar_riddle

    There seems to be a discrepancy, as there cannot be two answers ($29 and $30) to the math problem. On the one hand it is true that the $25 in the register, the $3 returned to the guests, and the $2 kept by the bellhop add up to $30, but on the other hand, the $27 paid by the guests and the $2 kept by the bellhop add up to only $29.

  5. Barber paradox - Wikipedia

    en.wikipedia.org/wiki/Barber_paradox

    It was suggested to Russell as an alternative form of Russell's paradox, [1] which Russell had devised to show that set theory as it was used by Georg Cantor and Gottlob Frege contained contradictions. However, Russell denied that the Barber's paradox was an instance of his own: That contradiction [Russell's paradox] is extremely interesting.

  6. Gabriel's horn - Wikipedia

    en.wikipedia.org/wiki/Gabriel's_horn

    The apparent paradox formed part of a dispute over the nature of infinity involving many of the key thinkers of the time, including Thomas Hobbes, John Wallis, and Galileo Galilei. [12] The analogue of Gabriel's horn in two dimensions has an area of 2 but infinite perimeter. There is a similar phenomenon that applies to lengths and areas in the ...

  7. Staircase paradox - Wikipedia

    en.wikipedia.org/wiki/Staircase_paradox

    In mathematical analysis, the staircase paradox is a pathological example showing that limits of curves do not necessarily preserve their length. [1] It consists of a sequence of "staircase" polygonal chains in a unit square , formed from horizontal and vertical line segments of decreasing length, so that these staircases converge uniformly to ...

  8. Ant on a rubber rope - Wikipedia

    en.wikipedia.org/wiki/Ant_on_a_rubber_rope

    A key observation is that the speed of the ant at a given time > is its speed relative to the rope, i.e. , plus the speed of the rope at the point where the ant is. The target-point moves with speed v {\displaystyle v} , so at time t {\displaystyle t} it is at x = c + v t {\displaystyle x=c+vt} .

  9. Chessboard paradox - Wikipedia

    en.wikipedia.org/wiki/Chessboard_paradox

    Chessboard paradox. The chessboard paradox [1] [2] or paradox of Loyd and Schlömilch [3] is a falsidical paradox based on an optical illusion. A chessboard or a square with a side length of 8 units is cut into four pieces. Those four pieces are used to form a rectangle with side lengths of 13 and 5 units.