Respuesta :
Answer:
120
Step-by-step explanation:
A triangles angles always add to 180 degrees.
180=20+40+x
180-20=160
160-40=120
120=x
Answer:
120
Step-by-step explanation:
A triangles angles always add to 180 degrees.
180=20+40+x
180-20=160
160-40=120
120=x