What was the Delian problem?
Trisecting the angle
Prediction of a solar eclipse
Squaring the circle
Doubling the cube
Doubling the cube, also known as the Delian problem, is an ancient geometric problem. Given the edge of a cube, the problem requires the construction of the edge of a second cube whose volume is double that of the first. As with the related problems of squaring the circle and trisecting the angle, doubling the cube is now known to be impossible using only a compass and straightedge, but even in ancient times solutions were known that employed other tools.
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Answers by country
Trisecting the angle
Prediction of a solar eclipse
Squaring the circle
Doubling the cube
answers
Australia
29
Greece
34
the Netherlands
13
Poland
1912
the United States
50
Switzerland
17
the United Kingdom
45
Germany
199
Republic of Ireland
11
Pakistan
11
India
33
Austria
41