Answer:
Equation: 3y=180
m<ABC=120
Step-by-step explanation:
We know that this angle in total is 180 degree, because it's flat and half a circle. It says that ABC = 2y and BCD = y
So, we can say that 2y+y=180.
2y is what we are trying to find out, so if we divide 180 by 3 (to isolate y), we get [tex]y=60[/tex]
So, we can multiply y by 2 to get a total of 120 degrees.
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