Vocabulary

prism: a $3D$ shape with two identical parallel faces. All other faces are rectangles. For example,

pyramid: a $3D$ shape with a polygon face and triangular faces that meet at a point. For example,

Let's investigate

Lee has a triangular prism made from modelling clay.
He cuts it straight through with a sharp knife and looks at the faces of the two new shapes he has made.

Which of these shapes could not be one of the faces of the new shapes?
triangle          rectangle          trapezium            rhombus

1) Write down the 3D shape each net would make.

2) Which of these nets would fold up into a prism?

3) Write a set of instructions to help someone decide if a net will fold up to make a prism.
4) Which of these nets can fold up into a pyramid?

5) Write a set of instructions, to help someone decide if a net will fold up to make a pyramid.