To find the minimum number of straight lines in the given figure, follow these steps:

1. Examine the overall shape of the figure. The figure has the overall shape of a rhombus comprising several triangles.
2. Count the lines forming the outer boundary of the rhombus. There are 4 lines in total.
3. Count the lines within the rhombus that divide it into triangles. Observe from top to bottom and left to right.
4. Identify and count these internal lines systematically:
   • 1 horizontal line across the middle.
   • 1 vertical line from top to bottom intersecting the horizontal line.
   • 1 diagonal line from the top left to the bottom right corner.
   • 1 diagonal line from top right to the bottom left corner.
5. Total the lines: 4 outer + 4 internal = 8 lines.
6. Count additional internal lines intersecting within the major quadrilateral divisions:
   • There are 4 additional lines from further divisions seen in smaller triangles within the figure.
7. Add the additional lines: 8 + 4 = 12 lines.

Thus, the minimum number of straight lines in the figure is 12.