Which of the folloiwng sets of angles can form a triangle?
Options:
A .  
90∘,30∘,90∘
B .  
70∘,70∘,70∘
C .  
30∘,20∘,110∘
D .  
80∘,40∘,60∘
Answer: Option D : D
We know that " Sum of interior angles of a triangle = 180∘ 80∘+40∘+60∘=180∘. The sum of angles in all the other sets is more than 180∘ ∴80∘,40∘,60∘ is the correct option.
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