Question

find the genreal rule that gives the number of matchsticks in terms of the number of triangles

Answer 1

Answer:

As in Exercise 11 (a) above find the general rule that gives the number of matchsticks in terms of the number of triangles. If we remove 1 from each then they makes table of 3, i.e., 3, 6, 9, 12, … So the required equation = 3x + 1 , where x is the number of squares.