Answer:
45 cm
Step-by-step explanation:
Since the two triangles are congruent to each other, their sides will also be equal to each other.
So, sides of triangle LMN = sides of triangle FGE
Perimeter of triangle FGE = 9 + 15 + 21
= 45 cm
So, perimeter of triangle LMN will also be 45 cm
Hope you understood!!
