if youre talking about a semi circle or a hemisphere, theyre both half circles.
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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.
semi-sphere
A square,sphere,semi-circle,
If its 2d its called a semi-circle, if its 3d its called a semi-sphere.
A Semi-Sphere :)