2x+10°+2x-10°+180°-x=360° 4x-x=360°-180° 3x=180° x=60° 2x+10+a=180° 2.60°+10°+a=180° 130°+a=180° a=50° b=70°
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2x+10°+2x-10°+180°-x=360° 4x-x=360°-180° 3x=180° x=60° 2x+10+a=180° 2.60°+10°+a=180° 130°+a=180° a=50° b=70°