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 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: - Q:
## How do you figure area?

A:The area of any simple shape, such as a circle, triangle or rectangle, can be found by taking a series of measurements from the shape and plugging them into a formula. The necessary formula varies according to the shape but works for all shapes of that type.

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## What are points that lie in the same plane?

A:

Full Answer >**Points that lie in the same plane are called coplanar points.**Points that do not lie in the same plane are non-coplanar. Two points are always coplanar, but three or more points may or may not be coplanar.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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