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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Trisecting the angle
Prediction of a solar eclipse
Squaring the circle
Doubling the cube
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