Rectangle – a rectangle with all angles straight (equal to 90 degrees).
In Euclidean geometry it is enough that at least three of its corners were straight, then the fourth corner by virtue of the theorem about the sum of corners of a polygon will also be equal to 90°. In non-Euclidean geometry where the sum of corners of a quadrangle is not equal 360°, rectangles do not exist.
Square SVG Properties
A rectangle is a parallelogram – its opposite sides are parallel in pairs.
The sides of the rectangle are its heights.
The Square SVG of the rectangle is equal to the sum of squares of its two adjacent sides (according to Pythagoras’ theorem).
Near any rectangle it is possible to describe a circle, and the diagonal of a rectangle is equal to diameter of the described circle (the radius is equal to half a diagonal).
Square SVG and sides
The length of a rectangle is the length of a longer pair of sides, and the width is the length of a shorter pair of sides.
The size of the area of a rectangle is equal to the product of the width of the rectangle on its length.
The perimeter of a rectangle is equal to the doubled sum of its width and length.
Diagonals of the rectangle
The diagonal lengths of the rectangle are equal.
The diagonals of the rectangle are divided by the intersection point in half.
The length of the diagonal of the rectangle is calculated by the theorem of Pythagoras and is equal to the square root of the sum of squares of length and width.