Geometry - compass and straight edge

[neo101]

Hi ,, is there any method how to grab into compass ,by using just compass and straight edge side length of a cube ,which is inside a sphere ,touching this sphere by its corners , but of course this sphere is given as a circle in 2D plane ... sry for english ,but i hope you understand what i mean.

 

[Deleted member 4993]

Hi ,, is there any method how to grab into compass ,by using just compass and straight edge side length of a cube ,which is inside a sphere ,touching this sphere by its corners , but of course this sphere is given as a circle in 2D plane ... sry for english ,but i hope you understand what i mean.

do you know how to draw 90° and 45° angles using compass and ruler?

 

[neo101]

do you know how to draw 90° and 45° angles using compass and ruler?

of course ,lol

 

[Deleted member 4993]

of course ,lol

Then draw two 45° angles on a diameter of circle -and you can draw the square inside a circle.