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This statement is false. Although the Greeks thought some constructions impossible, not all of the so called impossible problems were later proven to be possible.

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Q: Although the Greeks thought some constructions impossible all of the so called impossible problems were later proven to be possible in the 18th and 19th centuries?
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Although the Greeks thought some constructions impossible all of the so-called impossible problems were later proven to be possible in the 18th and 19th centuries?

No. They were not proven to be possible.


Is it true that you cannot bisect an angle using paper folding constructions?

No. It is possible to fold an angle on paper to bisect it.


It's impossible to use a Cartesian coordinate system to measure three-dimensional objects?

It is possible, but you need to use three axes.


Is it possible to draw a triangle with three right angles on a sphere?

It is impossible to have a triangle with 3 right angles. It is possible to draw a triangle with three right angles on the surface of a sphere: www.metacafe.com/watch/769025/270_degree_triangle_yes_3_right_angles


What is the weight of a ball having density 2.86 cm and 12.6 cm volume?

It is not possible to answer the question because: density is not measured in cmvolume is not measured in cmwhile mass = density*volume, weight in not directly related to density.It is impossible to guess the correct units for density and volume. It is not possible to answer the question because: density is not measured in cmvolume is not measured in cmwhile mass = density*volume, weight in not directly related to density.It is impossible to guess the correct units for density and volume. It is not possible to answer the question because: density is not measured in cmvolume is not measured in cmwhile mass = density*volume, weight in not directly related to density.It is impossible to guess the correct units for density and volume. It is not possible to answer the question because: density is not measured in cmvolume is not measured in cmwhile mass = density*volume, weight in not directly related to density.It is impossible to guess the correct units for density and volume.