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Q.

If a triangle has two angles of 40° and 60°, find the third angle.


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a

90o

b

80o

c

70o

d

60o  

answer is B.

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Detailed Solution

Given that, the two angles of triangle be 40° and 60°
Let the third angle be x.
Since, the sum of all angles of a triangle is equal to 1800. So,
⟹40∘+60∘+x=180∘ ⟹100∘+x=180∘ ⇒x=80∘ Hence, the third angle is 80∘.
Therefore, option 2 is correct.
 
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