Q:
# What is a closed plane figure with three or more line segments?

**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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Q:
## What is the side splitter theorem?

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## What is an oblique line?

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Q:
## What are parallel line segments?

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Q:
## What is the perpendicular bisector theorem?

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