Respuesta :

ShenYuxi

Answer:

所以我们得到了前半部分 3y，后半部分是 90 度。总和是 180 度所以做 3y+90=180 并解决！！

8555cashio
Since it is a right angle we know it is 90 degrees. There are three equal divisions of y. So each y is equal to 30 degrees