Question

in terms of the number of squares. (Hint: If you remove the vertical stick at the
end, you will get a pattern of Cs.)
(b) Fig 11.7 gives a matchstick pattern of triangles. As in Exercise 11 (a) above, find
the general rule that gives the number of matchsticks in terms of the number of
triangles.
A
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Answer 1

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.