Henry Ernest Dudeney/Puzzles and Curious Problems/188 - Squaring the Circle/Mistake

Source Work

 * Geometrical Problems
 * Dissection Puzzles
 * $188$. -- Squaring the Circle
 * $188$. -- Squaring the Circle


 * Geometrical Problems
 * Circle Puzzles
 * $289$. Squaring the Circle
 * $289$. Squaring the Circle

Mistake

 * The distance $DG$, added to the distance $GH$, gives a quarter of the length of the circumference, correct within a five-thousandth part.

Correction

 * $\dfrac {1.571174 - 1.570796} {1.571174} \approx 4155$

That is, it is correct within a $4000$th part, but not a $5000$th part.