If two angles of a triangle are 30∘,120∘, then the triangle will be
A
Right angle triangle
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B
Scalene triangle
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C
Equilateral triangle
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D
Isosceles triangle
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Solution
The correct option is D Isosceles triangle Let the third angle be 'x' 30∘+120∘+x=180⇒x=180∘−150∘⇒x=30∘ Here, two angles are equal then it is an isosceles triangle.