A semicircle.
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A hemisphere is a 3-d shape and so does not have a name as a 2-d shape. 2-d sections of a hemisphere can be circles, semicircles, or sections of circles, depending on the inclination of the intersecting plane.
this is the shape of 2d cone
It's a 2D shape.
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.
it a triangle as a 2d shape