Inside a Insider

Geometry Level pending

A first sphere has a radius of a. About this sphere circumscribe a regular tetrahedron . About htis tetrahedron circumscribe a second sphere with radius b. About this secomd sphere circumscribe a cube. About this cube circumscribe a third sphere with radius c. Find a:b:c.

7:8:9 3:4:5 1:1:1 5:6:7 1:3:3√3 1:2:3 1:2:2√2 4:5:6

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