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Delhi Police Constable Exam Model Paper 3

Question : 72 of 100

Marks: +1, -0

Solution:

Concept Used:

Where,

n= number of small triangles

H = number of ‘end to end’ horizontal lines

→ In, ∆ABC:

n= number of small triangles = 3

H = number of ‘end to end’ horizontal lines = 1 (BC,)

Triangles =

3 \times \frac{3+1}{2} \times 1 = 6

Hence, Total triangles in ∆ABC = 6

→Now Adding all the ∆s:

Total ∆s = 12 + 6 = 18

Hence, the correct answer is 18.

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