a, b, c, are three angles of a triangle. if a-b=15, b-c=30.. find <α <b <c
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a+b+c=180
15-b+b+30+b=180
45+b=180
b=180-45
b=135
15-b+b+30+b=180
45+b=180
b=180-45
b=135
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