Montessori Geometry
Parts of a Quadrilateral
The different parts of a quadrilateral and their definitions: side, angle, vertex, base, height, diagonal, perimeter, and area.
What are the parts of a quadrilateral?
Learn about the parts of a quadrilateral, with definitions and diagrams, in this short video.
The size of the surface covered by a quadrilateral is called its area.
Each of the line segments that form the quadrilateral’s boundaries is called a side. A quadrilateral has four sides.
- Sides that share an endpoint are called adjacent sides.
- Sides that don’t share an endpoint are called opposite sides.
The total length of the four sides is called the perimeter.
The point where two sides meet is called a vertex. A quadrilateral has four vertices.
An imaginary line joining two opposite vertices is called a diagonal.
The angle formed by two adjacent sides is called an interior angle (or, simply, an angle). A quadrilateral has four angles.
The side upon which the quadrilateral is resting is called its base.
The length of a perpendicular line from the base to the side opposite the base is called the height.
Can you now identify the parts of a quadrilateral? Reinforce your learning with the worksheet below.
Note on the Worksheets
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Parts of a Quadrilateral: Worksheet
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