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.

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## What is altitude in geometry?

A:

Full Answer >**Altitude in geometry (also known as height) refers to a segment that extends from any vertex of a triangle and is perpendicular to the line found on the opposite side.**This term is also employed to refer to the length of this segment.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 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 are two different ways to name a plane?

A:A plane can be regarded as a single letter, written in upper case and in cursive lettering, such as plane Q. It can also be named by identifying three points on the plane that do not form a straight line.

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