Explanation:
Opposite angles and sides are equal, so if the angle in left top corner = y°, then another top angle = y° too.
Answer:
y=45 x=15
y+3y=180
4y=180
y=45
3y+3x=180
3(45)=135
135+3x=180
3x=45
x=15
3.4m questions
4.4m answers