find the measures of angle a, angle b, and angle c.
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angle B=70 opposite angle
angleA+angleB=100 exterior angle theorem
angleA+70=100
angleA=100-70
angle A=30
A+B+C=180° measure of a triangle
30°+70°+C=180°
110°+C=180°
angle C=180-110
angle C= 70°
angleA=30°
angleB=70°
angleC=70°
angleA+angleB=100 exterior angle theorem
angleA+70=100
angleA=100-70
angle A=30
A+B+C=180° measure of a triangle
30°+70°+C=180°
110°+C=180°
angle C=180-110
angle C= 70°
angleA=30°
angleB=70°
angleC=70°
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