Not sure
a rectangle
The description given fits that of a triangle.
A net for the 3D shape.
No because it is flat 2d shape with 4 equal sides
net
That would be a triangle.
Solid.
No. A triangle is a two-dimensional figure. It has only length and width, but not thickness. It's a flat shape that can be drawn on a piece of paper, whereas solids are 3-dimensional (for example, a pyramid).
A tetrahedron.
A polyhedron.
Cylinder
rectangle
a rectangle
shapes can`t be solids. You can say that a shape is a triangle but u can`t say that a triangle is a solid. shapes are 2D unless your talking about the face of a 3D object
The description given fits that of a triangle.
A net for the 3D shape.
No because it is flat 2d shape with 4 equal sides