

Rectangle
From Latin: rectus "right" + angle
Try this Drag the orange dots on each vertex
to reshape the rectangle.
The rectangle, like the
square,
is one of the most commonly known
quadrilaterals. It is defined as having all four interior angles 90°
(right angles).
Properties of a rectangle
 Opposite sides are
parallel and
congruent
Adjust the rectangle above and satisfy yourself that this is so.
 The diagonals
bisect each other
 The diagonals are
congruent
Calculator
Use the calculator on the right to calculate the properties of a rectangle.
Enter the two side lengths and the rest will be calculated.
For example, enter the two side lengths. The area, perimeter and diagonal lengths will be found.
Other ways to think about rectangles
A rectangle can be thought about in other ways:
 A
square
is a special case of a rectangle where all four sides are the same length.
Adjust the rectangle above to create a square.
 It is also a special case of a
parallelogram
but with extra limitation that the angles are fixed at 90°.
See Parallelogram definition and adjust the parallelogram to create a rectangle.
Coordinate Geometry
In
coordinate geometry,
a rectangle has all the same properties described here, but also, the coordinates of its vertices (corners)
are known. See Rectangle (Coordinate Geometry) for more.
Other rectangle pages:
Area of a rectangle
Perimeter of a rectangle
Golden rectangle
Rectangle (Coordinate Geometry)
Other polygon topics
General
Types of polygon
Area of various polygon types
Perimeter of various polygon types
Angles associated with polygons
Named polygons
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