A: ### Quick Answer

**A closed plane figure with three line segments is called a triangle.** If the closed plane figure has more than three line segments, it is called a polygon. The word “poly” means “many,” and there are different names for such figures.

A closed plane figure with four line segments is called a quadrilateral. This is the most common type of closed plane figure in geometry. A parallelogram, a rectangle, a square, a rhombus and a trapezium are all examples of quadrilaterals.

A closed plane figure with five sides is called a pentagon. A six and seven-sided figure is called a hexagon and a heptagon respectively. Similarly, a decagon has ten sides, and an octagon has eight sides.

Learn more about Geometry- Q:
## What is the side splitter theorem?

A:

Full Answer >**The side splitter theorem states that if a line parallel to one side of a triangle intersects with the other two sides, it divides those two sides proportionally.**This theorem can be used to solve many similar triangle math problems.Filed Under: - Q:
## What are parallel line segments?

A:

Full Answer >**Parallel line segments are any two line segments that run parallel to each other, which means that they will never cross.**The length or thickness of each line does not matter.Filed Under: - Q:
## What is the perpendicular bisector theorem?

A:

Full Answer >**The perpendicular bisector theorem is applicable for line segments.**The theorem states that the perpendicular bisector is a line that represents the locus of points that are equidistant from the endpoints of the line segment that it intersects.Filed Under: - Q:
## What is a plane in geometry?

A:

Full Answer >**In geometry, a plane is defined as a flat, infinite surface.**It has infinite length and width but no thickness. A plane is thus a two-dimensional, boundless surface and a subset of space.Filed Under:

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