Making 3D shapes

This task is about making up 3-D shapes.

Practical task

 
Use the toothpicks, skewers and modelling clay or plasticene to make each of the following shapes.
 
a)
Cube.
 
 
 
b)
Triangle-based pyramid.
 
 
 
c)
Rectangular prism.
 
 
 
d)
Triangular prism.