Quadrilateral
Contents
Definition
A quadrilateral is a four-sided polygon. Some special quadrilaterals include squares, rectangles, rhombi, parallelograms, trapezoids, kites, and cyclic quadrilaterals.
Types of quadrilaterals
Kite
- Main article: Kite
A kite is a quadrilateral with two pairs of adjacent congruent edges.
Cyclic Quadrilateral
- Main article: Cyclic quadrilateral
A cyclic quadrilateral is a quadrilateral that is cyclic.
Parallelogram
- Main article: Parallelogram
A parallelogram is a quadrilateral with two pairs of parallel edges.
Rhombus
- Main article: Rhombus
A rhombus is an equilateral parallelogram.
Rectangle
- Main article: Rectangle
A rectangle is an equiangular parallelogram.
Square
- Main article: Square (geometry)
A square is any figure that is both a rectangle and a rhombus.
Introductory topics
Resources
Books
Intermediate topics
Resources
Books
- Challenging Problems in Geometry -- A good book for students who already have a solid handle on elementary geometry.
- Geometry Revisited -- A classic.
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