A heavy external coating of insulation on the surface of a spherical tank enables the temperature of the liquefied natural gas stored inside to be maintained at a temperature of $-165^{\circ} \mathrm{C}$. How many square metres of insulation are needed for a sphere of radius $36.3 \mathrm{~m}$ ?

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The Answer of A heavy external coating of insulation on the surface of a spherical tank enables the temperature of the liquefied natural gas stored inside to be maintained at a temperature of $-165^{\circ} \mathrm{C}$. How many square metres of insulation are needed for a sphere of radius $36.3 \mathrm{~m}$ ?

A Heavy External Coating of Insulation on the Surface of a Spherical