7² = 3²+5²-2*3*5cosa
49 = 34-30cosa
cosa = (34-49)/30
a = acos(-15/30
a = 120°
a is angle ADC.
b = 180-a
b = 60°
b is angle ADB.
Therefore, the required angle, angle ABC is;
Let it be c.
c+70+60 = 180
c = 180-60-70
c = 180-130
c = 50°
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