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Discussion :: Analytical Reasoning

  1. Find the number of triangles in the given figure.

    2. A.
    18
    B.
    20
    C.
    28
    D.
    34

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    Answer : Option C

    Explanation :

    The figure may be labelled as shown.

    The simplest triangles are AEI, AIH, BEJ, BJF, CFK, CKG, DGL, DLH, EOJ, FOJ, FOG, LOG, HOL and HOE i.e. 14 in number.

    The triangles composed of two components each are EAH, FBE, BEO, EOF, BFO, FCG, GDH, HOD, HOG and GOD i.e. 10 in number.

    The triangles composed of three components each are EFH, EHG, FGH and EFG i.e. 4 in number.

    Thus, there are 14 + 10 + 4 = 28 triangles in the given figure.

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