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Because all circles are similar.
Circles and all regular polygons.
Half a sphere, which is a 3D shape, is called a hemisphere. The semi-circles in the question is a 2D shape and will make a circle.
if youre talking about a semi circle or a hemisphere, theyre both half circles.
Answer to part 1 = Oblong (ellipsoidal rectangle) Answer to part 2 - possibly egg-shaped? Probably still oblong though.