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The Shape That Has 8 Sides Is A Octagon Which Has 8 Equal Sides
well if you take octagon (8 sides) , in 3d shapes octagon is probably called octagonal prism. and the sides are actually called faces. AND a 7 sided shape , a heptagon, is called heptagonal prism
No 3D shape with FLAT SIDES has exactly 3 faces. 4 is the minimum.
A 3d shape with 10 sides is called a decahedron. I have added a link with some pictures of them. As you can see they look very different but all have 10 sides or faces.
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