Ответы на вопрос:
A) < a= 20° ,< b =60° ⇒ < c= 180 ° - (< a +< b)= 180° -(20°+60°)=180° -80° =100° . bc = 40° ,ac=120° ab = 200°. bc: ac : ab= 20 : 60 : 100 = 1: 3 : 5. b) < a =1/2(< b+< c)= 80° ; < b =1/2(< a +< c)= 60° ; < c= 1/2(< a +< b) = 40°.
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