A concave polygon.
An internal angle of the polygon.
a polygon
A polygon may have any number of sides. A shape with four sides is a type of polygon called a quadrilateral.
On the internet I found that a polygon with seven sides is called a heptagon.
They are angles between adjacent sides of the polygon, measured on the inside of the shape.
A 10 sided polygon is a decagon
It is called an octagon
It is called a 'polygon'.
A polygon is any 2-dimensional shape with straight sides. Such a shape with sides of equal length would be called an equilateral polygon. If it is also convex (all the angles face the same way), then it would be called a regular polygon.
A polygon with 7 sides is called an heptagon.
A shape with straight sides is called a polygon. But it can have 3 or 4 sides as well.
A polygon is a plane (2-dimensional) shape bounded by straight lines. It can have 3 or more sides. A polygon with 4 sides is a quadrilateral.