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Step-by-step explanation:
in (a) part as the outer surface is exposed and base is not exposed to sunlight.so we consider lateral surface area instead of total surface area.
and the figure resembles cone
l.s.a(lateral surface area) of cone = pi*r*s
s = slant height ,r= radius of base.
in (b) part volume of cube =pi*r*r*h/3
=22*4*4*3/3
=22*16=352 cubic units
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