Third exterior angle of a triangle with two exterior angles 90^o and 135^o is _______ .

95^o

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65^o

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105^o

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135^o

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Solution

The correct option is D
135^o

We know sum of all the three exterior angles of a triangle is 360^o.

Therefore,

90^o + 135^o + Third exterior angle = 360^o

225^o + Third exterior angle = 360^o

Third exterior angle = 360^o - 225^o = 135^o

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