Question 16

Find out the number of triangles in the given pattern.

Solution

No of unit triangles = 16

No of triangles with 2 or 3 unit triangles = 0

No of triangles with 4 unit triangles (vertex up + vertex down) = 6 + 1 = 7

No of triangles with 5,6,7,8 unit triangles = 0

No of triangles with 9 unit triangles = 3

Full triangle = 1

Total number of triangles = 27

Hence, option C is the correct answer.

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