Answer :
Answer:
Step-by-step explanation:
3y+4y+5y=180 degree(sum of exterior angles of a triangle is 360 degree)
12y=360
y=360/12
y=30 degree
Answer:
Step-by-step explanation:
3y+4y+5y=180 degree(sum of exterior angles of a triangle is 360 degree)
12y=360
y=360/12
y=30 degree