decahedron
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enneahedron
Solid 3D figures are called polyhedrons. To figure out what a polyhedron with a specific number of sides is, you take the Greek prefix for the number of sides, and add the suffix "-hedron" at the end: tetra=4, so it would be called a tetrahedron if it has 4 sides. penta=5, so pentahedron. hexa=6, hepta=7, octa=8, ennea=9, deca=10 So your figure would be called a decahedron. I hope this helps ^-^ ~제니치
No, it is a plane figure.
A plane figure has 2 dimensions (length & width$ & is represented by a flat surface. It takes 3 noncollinear points to make a plane. A solid figure has 3 dimensions. It not only has length & width but also depth. It takes 4 noncoplaner points to make space
A solid figure with twenty faces is called an Icosahedron.