What is rectangle? Rectangle is a Euclidean plane geometry shape with sides and four right angles. The word rectangle comes from the Latin "rectangulus", which is a combination of "rectus" (right) and "angulus" (angle).A rectangle is cyclic meaning all corners lie on a single circle. Note that for quadrilateral to be rectangle it needs to have the following properties.
- Opposite sides of a rectangle are parallel and congruent (same length)
- The angles of a rectangle are all 90 degrees or right triangle
- The diagonals divides the rectangle in half and they are congruent
From the above image the
W = Width of the rectangle. Both width are equal
l = Length of the rectangle. Both lengths are equal.
p = Diagonal of the rectangle.
q = Diagonal of the rectangle
Below are some important formulas for calculating parts of rectangle.
Rectangle Area Formula:
Area of a rectange is calculated by multiplying lengths with its width.
Area = length * width
A = L * W
Rectangle Perimeter Formula:
Perimeter of rectangle is simply the sum of all widths and lengths
Perimeter = (2 * Length) + (2 * Width)
P = 2L + 2W
Rectanlge Polygon Formula:
Polygon of a rectangle is simply square root of the perimeter.
q = √ (l 2 + w 2)
Use the Rectangle calculator above to calculate various parts of rectangle.
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