Answer:
Pentagon, regular.
Explanation:
The given figure is a polygon which is a figure with at least three sides which enclose certain area.
If a polygon has three sides, it's called a triangle.
If a polygon has four sides, it's called a quadrilateral.
If a polygon has five sides, it's called a pentagon.
Now, polygons can be regular or irregular, this depends on the equivalence of its sides, if the polygon has all equal sides, then it's called regular polygon.
In this case, we have a polygon with 5 equal sides, therefore it's a pentagon, which is a regular polygon with 5 equal sides.
Therefore, the right answer is the last choice.