Answer:
15,18,21
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Step-by-step explanation:
the circumference is 20pie or 62.83185307
x = 9
50+80+(6x-4)=180 (ANGLE SUM PROPERTY)
130 +(6x-4)=180
6x-4=180-130
6x-4=50
6x=50+4
x=54/6