Answer: (A)
.
Explanation:
Perimter is the sum of the all sides of a figure.
As the given design has three exactly same or identical triangles with side-lengths
joined by ending vertices.
Then, the combined operimetr of thge design would be :
3 x (Perimeter of the one triangle)
For this , Perimeter of one triangle =
Now , the combined operimetr of thge design would be :
or
Hence, the correct option is (A)
.