Question

A regular polygon having 12 sides have one of its side measure $12$ cm. Find the perimeter of the given polygon.

• A. $120$ cm
• B. $144$ cm
• C. $140$ cm
• D. $130$ cm

Answer 1

The correct option is B $144$ cm

We know regular polygon are those which have all its sides of equal length and all its interior angles equal.
That means Regular polygons are equilateral as well as equiangular.

For example-

In Polygon $ABCD$ all its sides are equal and all angles are equal.

Now regular polygon of 12 sides will have all its sides equal and its perimeter is sum of all side length.

Perimeter of polygon= sum of all sides
$\text{Perimeter}=12+12+12+12+12+12+12+12+12+12+12+12$
$\text{perimeter}=12\times 12=144$ cm

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