please answer it ............
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Step-by-step explanation:
r=4.2/2=2.1 cm and h=2.8c
l=√(r²+h²).
l=√(2.1²+2.8²)=√(4.41+7.84)=√12.25=3.5cm
Total surface area of remaining
solid=
πr(2h+l+r)
=22/7×2.1(2×2.8+3.5+2.1)
=6.6(11.2)=73.92cm²
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