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makaa jumlah kaan bsar sdut segitiga trsebuut
contoh:
(i) 2a° + 3a° + 35° = 180°
5a° = 180° -35°
a = 145°/5
a = 29°
subst :
2a° = 2 (29) = 58°
3a° = 3 (29) =87°
jadiii,, cobak lnjuutkn ke nmorr slanjuutnyaa :)