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Which of the following form the three angles of a triangle.

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none of these

$90 °, 30 °, 50 °$

$50 °, 60 °, 70 °$

$30 °, 60 °, 80 °$

answer is C.

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Detailed Solution

The sum of the angles of a triangle is $180 ° .$

Options A:

$90 ° + 30 ° + 50 ° = 170 °$ , then it is not a triangle.

Option B:

$30 ° + 60 ° + 80 ° = 170 °$ , then it is not a triangle.

Option C:

$50 ° + 60 ° + 70 ° = 180 °$ , then it is a triangle.

Hence, option C is the correct answer.

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