Respuesta :

ANCKPOP

Answer:

21 cm

Step-by-step explanation:

Ver imagen ANCKPOP
Answer is 21 cm

Step by step.

An equilateral triangle has the same length on all three sides.
The question gives you the base of 7cm, since all sides are equal, all sides are 7cm.
Perimeter is all sides added together so 7 + 7 + 7 = 21cm.