Respuesta :

apologiabiology

those lines mean the sides are congruent

since they are congruent, the angles opposite them are congruent

that means 3x=60

divide by 3 both sides

x=20

x=20 degrees

AnimeBrainly
x = 20, 

i forgot how to explain it sorry

but i know it is 20 due to the fact that the 2 sides are congruent

hope this helps