Respuesta :

Answer:

51

Step-by-step explanation:

I mean it should add up to 180 so

180 = 63+66+x

x=51

funnynumberhaha

Answer:

51

Step-by-step explanation:

Since there are two angles already filled in, we should know that a straight line equals 180°, meaning that we can add the two angles we already have (which makes 129) and subtract it by 180

180

- 129

____

51

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