RotationMethod SolidGemoetry LawOfCosines PlaneGeometry Intermediate
2011
Problem - 3144
In tetrahedron $ABCD$, $\angle{ADB} = \angle{BDC} = \angle{CDA} = 60^\circ$, $AD=BD=3$, and $CD=2$. Find the radius of $ABCD$'s circumsphere.
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