A square is not a pentagon. Pentagons have 5 sides, squares have 4.
It can be either.
it is a shape with 180degrees or less
Only when the polygon is a regular convex polygon. Such as an equilateral triangle, or a square, or a regular pentagon.
520 Degrees
It is a 5 sided shape with the properties that any line segment between two vertices of the pentagon remain in the boundaries of that pentagon. It generalizes to polygons.
A convex pentagon is one in which none of the interior angles are reflex.
A regular pentagon is convex. By taking a regular pentagon and shortening or lengthening one or more sides, an infinite number of possible convex pentagons can be created. A convex polygon is defined as a polygon such that all internal angles are less than or equal to 180 degrees, and a line segment drawn between any two vertices remains inside the polygon. It is possible to have non-convex (concave) pentagons; there are infinite number possible ways to do this, too.
It can be either.
== ==
it is a shape with 180degrees or less
Only when the polygon is a regular convex polygon. Such as an equilateral triangle, or a square, or a regular pentagon.
It is a pentagon with five equal angles - each interior angle = 108 degrees. The term "convex" is redundant since, if the pentagon is equiangular, it cannot have 5 re-entrant corners.
a pentagon is any five-sided polygon.
I would say a convex irregular pentagon. Convex as any line drawn between two points can be contained inside the shape, Pentagon since it is 5 sided, but irregular because if you look at it topographically, it looks like the side of a house. As opposed to the true pentagon whose east-west walls are angled out and the sum of the angles is 540 degrees.
520 Degrees
Pentagons (including convex pentagons) have five sides. (The prefix penta- is greek for 5)
That would be a pentagon...