pyramid
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You only said no one. There could be any number of objects in there with you. Therefore, the question is impossible to answer accurately.
plane
If we remove a cube from the corner then cavity we get to see can be considered in the form of a cuboid room and the room doesn't has roof and front wall because the cube is removed from the corner(you can consider any two surfaces).Let us say the side of larger cube be A then its surface area is 6A2.And we have removed a cube of side a from the corner. After removing we get 4 squares of side a in the cavity and the area is 4 x a2. But the roof and front wall is not there so there is decrease in area by 2 x a2.So, the surface area of new figure is 6A2 + 4a2 - 2a2 = 6A2 + 2a2.So the surface area of new figure is more than the original cube.
O
A curved desk will save space when you put it in a corner of the room. If you put a regular desk in a corner you will lose some room, because you waste a bit of wallspace.