Sum of the exterior angles of a triangle is ___ .

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180

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360

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135

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Solution

The correct option is C
360

The angle sum property of a triangle states that the sum of the interior angles of a triangle is 180 $^{\circ}$ .
Also, each pair of interior and exterior angles of a triangle form a linear pair. So, in total there are 3 linear pairs.
Sum of interior and exterior angles of a triangle = $3 \times 180^{\circ} = 540^{\circ}$
Sum of exterior angles = $540^{\circ} -$ sum of interior angles
= $540^{\circ} - 180^{\circ} = 360^{\circ}$

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