What is the minimum number of sticks needed to add three more equilateral triangles to it?

Question

You are given an equilateral triangle of three matchsticks like given figure. What is the minimum number of sticks needed to add three more equilateral triangles to it?

Answer 1

Ans Three more sticks to be added to add three equilateral triangles
Three sticks are to be placed in midpoint of existing match sticks to form four equilateral triangles (1+3)