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1 . The ratio of the angles of a triangle is 2 : 3 : 4. What is the largest angle in degrees?

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Answer: Option C

Explanation:

Let the angles be 2x, 3x and 4x respectively.

Now, 2x + 3x + 4x = 180°

or, 9x = 180°

or, x = 180/9 = 20

So, the largest angle = 4x = 4 x 20 = 80°