一道GMAT数学题.
A right circular cone is inscribed in a hemisphere so
that the base of the cone coincides with the base of
the hemisphere.What is the ratio of the height of the
cone to the radius of the hemisphere?
(A)根3：1
(B) 1:1
(C) 1/2:1
(D) 根2:1
(E) 2:1