Plus sides 15
Divided sides by 5
Thus ;
A = 2 ( 25 ) - 9°
A = 50° - 9°
A = 41°
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B = 3 ( 25 ) - 6
B = 75° - 6°
B = 69°
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C + 110° = 180°
because it is a straight line.
Subtract sides 110°
C + 110° - 110° = 180° - 110°
C = 70°
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And we're done.....♥️♥️♥️♥️♥️