a hemispherical depression is cut out from one face of a cubical wooden block of edge 21 cm, such that the diameter of the hemisphere is equal to the edge of the cube . determine the total surface area of the remaining block.
no need to tell the full answer plz just explain that
why did we ADD the CSA of hemisphere despite it is being CUT from the cube???
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we have to determine the total surface area of remaining block first we take full surface area of cube then we cut a hemisphere from that cube we need curved surface area because we need only the curved area of hemisphere from that cube and we easily find the total surface area of remaining block
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