Q:
# What Is a Concave Polygon?

**According to Math Open Reference, a concave polygon refers to a polygon or a plane figure that has one or more interior angles that measure greater than 180 degrees.** This type of polygon is the opposite of the convex polygon.

Math Open Reference indicates that a concave polygon looks like a vertex that is pushed in toward the inside of the figure. One of the characteristics of a concave polygon is that some of its diagonals lie outside the polygon's interior space. Moreover, the area of a concave polygon can be calculated by using the same method of computing for the area of any other irregular polygons.

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Q:
## What Are Some Names of Irregular Shapes?

A: Unlike a regular shape, an irregular shape is a polygon with sides that aren't all equal and unequal angles. Some conventional geometric shapes, such as th... Full Answer >Filed Under: -
Q:
## What Is a Polygon With Four Sides and Four Angles Called?

A: A polygon with four sides and four angles is called a quadrilateral. Quadrilaterals are two-dimensional, closed shapes with angle measurements that add up ... Full Answer >Filed Under: -
Q:
## How Many Angles Does a Heptagon Have?

A: A heptagon is a figure or polygon that has seven angles and seven sides. The sum of these seven interior angles has to equal 900 degrees. Full Answer >Filed Under: -
Q:
## What Is a Five-Sided Polygon?

A: A five-sided polygon, with five vertices and five angles, is called a pentagon. The word pentagon is derived from the Greek words "pente" and "gonia," whic... Full Answer >Filed Under: