<1=х; <2=х+20; <1+<2=180°; х+х+20=180; 2х+20=180; 2х=180-20; 2х=160; х=160/2=80 → <1=х=80°; <2=х+20=80°+20=100°.
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<1=х; <2=х+20; <1+<2=180°; х+х+20=180; 2х+20=180; 2х=180-20; 2х=160; х=160/2=80 → <1=х=80°; <2=х+20=80°+20=100°.