Respuesta :

Answer:

7

Step-by-step explanation:

28/4 is 7

Answer:

The original triangle has side length 7 cm

Step-by-step explanation:

equilateral triangle has side length x



scaled equilateral triangle

side length 4x


= 28

28 = 4 x

divide by 4

28/4 =4x/4

7 =x

The original triangle has side length 7 cm