dodecahedron
Pentagon 2d shape is a pentagon 3d object is a pyramid.
2d
2-Dimensional
take, for an example, a duck. This is a 3d shape because it has three dimensions. Compare this to a square, which is 2d. the difference is that the duck has a beak, and the square does not.
Trapezoid is 3D. The shadow of this shape is called Trapezium.
It is a trapezoid which is a 2D shape whereas the rest are 3D shapes.
A trapezoid prism
Our maths teacher told us that it was a trapezoid. That's how you spell it. ENJOY!
3D trapezoid
Truncated pyramid.
trapezium
Oh, dude, you mean a 3D trapezium? That's like calling a square a 3D square, it's just a trapezoid. Adding that extra dimension doesn't change its name. It's still just a trapezoid, but with a little more pizzazz.
A Sphere is an the name for a shape of a 3D object that is like a ball or a globe. If the shape is 2D then it is a circle
A hexahedron is the name for a 6 sided 3D shape.
A nonagon is a 2D shape and there is not a 3D equivalent shape.
the name of a 20 sided 3d shape is called a icosahedron