Black and white triangle patterns
This task is about continuing a spatial pattern and writing a rule.
Mani made these shapes with some black and white triangles.
Shape 1  Shape 2  Shape 3 
This table shows the numbers of each colour of triangle Mani used when he made the first five shapes.
Shape number (n)

1

2

3

4

5

i) Number of black triangles (b)

1

3

5

7

9

ii) Number of white triangles (w)

3

5

7

9

11

iii) Total number of triangles (t)

4

8

12

16

20
