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Question

Which of the following pair of angles will make obtuse angle when added together ?

A
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B
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C
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D
None of the above
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Solution

The correct option is C
We know obtuse angles are those angles that measure greater than 90o and less than 180o.

If the sum of both the angles is greater than 90o but less than 180o, then that pair will make an obtuse angle.

In option(a),
45o+50o=95o which is greater than 90o and less than 180o.

In option(b),
120o+50o=170o, this is also an obtuse angle.

And, in option (c),
120o+58o=178o, this is also an obtuse angle.

Hence, option (a) (b) and (c) are correct.

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