Here we use 18 matchsticks to create a number of triangles.
Can we…
(a) Remove 3 matchsticks to have 6 triangles?
(b) Remove 4 matchsticks to have 5 triangles?
(c) Remove 5 matchsticks to have 5 triangles?
(d) Remove 6 matchsticks to have 5 triangles?
See if you can solve them all.
