उत्तर : 3. "15"
व्याख्या :

Answer: C) 15 Explanation: We may label the figure as shown. The Simplest triangles are AFB, FEB, EBC, DEC, DFB and AFD i.e 6 in number. The triangles composed of two components each are AEB, FBC, DFC, ADE, DBE and ABD i.e 6 in number. The triangles composed of three components each are ADC and ABC i.e 2 in number. There is only one triangle i.e DBC which is composed of four components. Thus, there are 6 + 6 + 2 + 1 = 15 triangles in the figure