Question

Question #d0991

Answer 1

I won't show you any calculations to get to answer , it would remain an oppurtunity to be solved by You .
however , i would tell you what part you didn't count .
Total Surface Area of cuboid `=2 (lb+bh+hl)`
total surface are can be calculated from this easily ,
now a conical cavity is removed so you also need to add the CSA (curved surface area) of cone because now that would also be counted because the new shape that we hot includes that are also , try to imagine .
Total area of new solid obtained = TSA of cuboid + CSA of cone - Base area of cone .