Building patterns
This task is about continuing a spatial pattern and writing a rule.
Here are the first three shapes in a pattern. 

a) b) 
Use the cubes to build Shape 4. Complete the table below for Shape 4. 


c)

How many cubes would be needed to build

i)
ii)
iii)

Shape 5? __________
Shape 6? __________
Shape 20? __________

d) 
Explain in words or symbols how to get the answer for shape 20 above.

e) 
Use your model of Shape 4 to show your teacher how this works.
