Question

The exterior angle measure of regular polygon having three sides is.

• A. ${118}^o$
• B. ${120}^o$
• C. ${180}^o$
• D. ${90}^o$

Answer 1

The correct option is B ${120}^o$

The regular polygon having three sides is an Equilateral triangle.

and also we know that regular polygons have all its exterior angles equal to each other and sum of all exterior angles of a polygon is ${360}^o$.

Let the exterior angle of equilateral triangle be $x$.

$\Rightarrow x+x+x={360}^o$
$\Rightarrow 3x={360}^o$
$\Rightarrow x=\frac{{360}^o}{3}$
$\Rightarrow x={120}^o$

Hence, correct option is $\left(b\right)$.