A solid metallic hemisphere of radius 5.4 cm is melted and recast into a right circular cylinder of radius 12 cm. What is the height (in cm) of the cylinder?
A0.625
B0.729
C0.468
D0.325
A0.625
B0.729
C0.468
D0.325
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A square pyramid is cut, open and laid flat as in the figure below. What is the surface area of this pyramid ?