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RotationMethod
SolidGemoetry
LawOfCosines
PlaneGeometry
Intermediate
2011
Problem - 3144
In tetrahedron
A
B
C
D
,
∠
A
D
B
=
∠
B
D
C
=
∠
C
D
A
=
60
∘
,
A
D
=
B
D
=
3
, and
C
D
=
2
. Find the radius of
A
B
C
D
's circumsphere.
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