question_answer

Find the number of minimum straight lines required to make figure?

A)  17               

B)  15

C)  19         

D)  13

Correct Answer: C

Solution :

  The triangles are:

\[\Delta ABF;\text{ }\Delta \text{ }BCD;\text{ }\Delta BHG;\text{ }\Delta BHI;\]

\[\Delta GHF;\text{ }\Delta \text{ }HID;\text{ }\Delta \text{ }FHE;\text{ }\Delta \text{ }HED;\]

\[\Delta \text{ }BFI;\text{ }\Delta \text{ }BDG;\text{ }\Delta \text{ }GFD;\text{ }\Delta \text{ }IFD;\]

\[\Delta \,BFE;\Delta \,BDE;\Delta \,HFD;\Delta \,BFD;\]

\[\Delta \,BHD;\Delta \,BHF;\]

There are 18 triangles.