Parallelogram calculator - diagonals, area, perimeter, sides
Parallelogram calculator will help you calculate the long diagonal of the parallelogram, the short diagonal of the parallelogram, the side length, heights, area of the parallelogram.

Parallelogram - information
Parallelogram - a quadrilateral whose opposite pairs of sides have the same length and are parallel. The diagonals of the parallelogram intersect exactly at half their length. The opposite angles are equal. The sum of the angles on the same side is 180°.
A special case of a parallelogram is a rhombus (all sides of the same length) and a straight angle (all right angles), and a square (all sides of the same length and right angles).
It has the following properties:
The parallelogram is a convex figure.
The sum of the measures of all interior angles is 2Π (360°), and the sum of the measures of two adjacent interior angles is Π, $$ \alpha + \beta = 180° $$
is: $$ \alpha = 180° - \beta $$ $$ \beta = 180° - \alpha $$
The sum of the measures of two adjacent angles at which the diagonals intersect is Π, $$ \gamma + \delta = 180° $$
as a result of: $$ \gamma = 180° - \delta $$ $$ \delta = 180° - \gamma $$
The point of intersection of the diagonals of the parallelogram divides each of them into halves.
Formula on the longer diagonal of the parallelogram from the sides and the angle α
$$ f= \sqrt{a^2+2ab \cos \alpha\ +b^2} $$
Formula on the longer diagonal of the parallelogram from the sides and the angle β
$$ f= \sqrt{a^2-2ab \cos \beta\ +b^2} $$
Formula on the longer diagonal of the parallelogram from the sides and the shorter diagonal
$$ f= \sqrt{2a^2 + 2b^2 - e^2} $$
Formula for the longest diagonal of the parallelogram from the field, the shorter diagonal and the angle between the diagonals
$$ f= \frac{2S}{e\cdot \sin \gamma} = \frac{2S}{e\cdot \sin \delta} $$
Formula for the shorter diagonal of the parallelogram from the sides and the angle α
$$ e= \sqrt{a^2-2ab \cos \alpha\ +b^2} $$
Formula for the shorter diagonal of the parallelogram from the sides and the angle β
$$ e= \sqrt{a^2+2ab \cos \beta\ +b^2} $$
Formula for the shorter diagonal of the parallelogram from the sides and the longer diagonal
$$ e= \sqrt{2a^2 + 2b^2 - f^2} $$
Formula for the shorter diagonal of the parallelogram from the field, the longer diagonal and the angle between the diagonals
$$ e= \frac{2S}{f\cdot \sin \gamma} = \frac{2S}{f\cdot \sin \delta} $$
Formula for the height of the parallelogram from the side and the area
$$ h_1=\frac{S}{a}; h_2=\frac{S}{b} $$
Formula for the height of the parallelogram from the side and angle
$$ h_1=b \cdot \sin \alpha; h_2=a \cdot \sin \alpha$$
Formula for the height of a parallelogram from perimeter, side, and angle
$$ h_1=\frac{(L-2a) \cdot \sin \alpha}{2}; h_2=\frac{(L-2b) \cdot \sin \alpha}{2} $$
Formula for the area of the parallelogram from the side and height
$$ S=a\cdot h_1; S=b\cdot h_2 $$
Formula for the area of the parallelogram from the sides and angle(α) or (β)
$$ S=a\cdot b \cdot \sin \alpha; S=a\cdot b \cdot \sin \beta $$
Formula for the area of a parallelogram from diagonals and angle(γ) or (δ)
$$ S=\frac {e \cdot f \cdot \sin \gamma}{2}; S=\frac {e \cdot f \cdot \sin \delta}{2} $$
Formula for the perimeter of the parallelogram from the sides
$$ L = 2a+2b = 2(a+b) $$
Formula for the perimeter of the parallelogram from the side and diagonals
$$ L = 2a+\sqrt{2e^2+2f^2-4a^2};$$ $$ L = 2b+\sqrt{2e^2+2f^2-4b^2} $$
Formula for the perimeter of the parallelogram from the side, height and angle α
$$ L = 2(a + \frac {h_1}{\sin \alpha});$$ $$ L = 2(b + \frac {h_2}{\sin \alpha}) $$
Formula for the sides of the parallelogram from diagonals and angle of intersection of diagonals
$$ a=\frac {\sqrt{e^2+f^2+2ef\cdot\cos \gamma}}{2}; a=\frac {\sqrt{e^2+f^2-2ef\cdot\cos \delta}}{2} $$
$$ b=\frac {\sqrt{e^2+f^2-2ef\cdot\cos \gamma}}{2}; b=\frac {\sqrt{e^2+f^2+2ef\cdot\cos \delta}}{2} $$
Formula for the side of the parallelogram from the other side and diagonals
$$ a=\frac {\sqrt {2e^{2}+2f^{2}-4b^2}}{2} $$ $$ b=\frac {\sqrt {2e^{2}+2f^{2}-4a^2}}{2} $$
Formula for the sides of the parallelogram from height and angle α
$$ a=\frac {h_2}{\sin \alpha} $$ $$ b=\frac {h_1}{\sin \alpha} $$