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2014-03-04T21:27:03+02:00
M (< B) + m(<A)+m(<C)=180 grade
m(<A)-m(<C)=65|+m(<C)
=> m(<A) = 65 + m (< C)
=> 65 + m(<C) + 3m(<C) + m(<C) = 180
65 + 5 m (<C)=180|-65
5m(<C)=115|:5
m(<C)=23 grande => m (<B) = 3x 23=69 grade
=> m (<A)= 65+ 23= 88 grade
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