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'Triangular Faces' printed from http://nrich.maths.org/

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Suppose we start with two types of triangles:
2 starttris
 
and we have lots of them ready to cut out and use (you could print off this sheet).
 
SmYellGreen


We will be putting them together to make 3D shapes.
Sometimes you need tabs to glue them together so you cut those out like these (here is a sheet of triangles with tabs):

Tabs
Well here is an image of 3D shape number 1 made from 6 green and 4 yellow triangles:
3d1
 
and here is a net that could be used to make it:
pict4
Have a go at making this or something similar. You might make it from a net or just by sticking the triangles together.
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Here is an image of 3D shape number 2:
3D2
 
This was made from 6 yellows and 2 greens.
Can you try and make it, and work out a net for it?
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Here is the last one of mine to try, made from 4 green and 2 yellow:
3d3

See if you can make this one and discover a simple net for it.