180°-70°=110°(В)
110°-х=180°-3х
х=35°
180°-35°=145°(А)
3×35°=105°(С)
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180°-70°=110°(В)
110°-х=180°-3х
х=35°
180°-35°=145°(А)
3×35°=105°(С)