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Question

The three exterior angles of a triangle are 130o,140o,xo then xo is:

A
90o
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B
100o
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C
110o
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D
120o
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Solution

The correct option is A 90o
The sum of the exterior angles of a triangle is 360 degree.
130+140+xo=360
xo=360140130
xo=360270=90o

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