from the top of a solid cone of height \( 12 \mathrm{~cm} \) and base radius \( 6 \mathrm{~cm} \...

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from the top of a solid cone of height \( 12 \mathrm{~cm} \) and base radius \( 6 \mathrm{~cm} \), a cone of height \( 4 \mathrm{~cm} \) is removed by a plane parallel to the base. Find the total surface area of the remaining solid. (Use \( \pi=22 / 7 \) and \( \sqrt{5}=2.236 \) ).
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