Variables

a, b
→
Sides
d1, d2
→
Diagonals
α, β
→
Angles
φ
→
Angle between diagonals
h
→
Height
P
→
Perimeter
A
→
Area
1.
Sum of angles in parallelogram
$\alpha + \beta = 180\degree$
Parallelogram
Angle
2.
$d_1^2+d_2^2=2\left(a^2+b^2\right)$
Parallelogram
3.
Height of a parallelogram
$h=b\sin\alpha$
Height
Parallelogram
4.
Height of a parallelogram
$h=a\sin\beta$
Height
Parallelogram
5.
Parallelogram perimeter
$P=2a+2b$
Parallelogram
Perimeter
6.
Area of parallelogram
$A=ah$
Area
Parallelogram
7.
Area of parallelogram
$A=ab\sin\alpha$
Area
Parallelogram
8.
Area of parallelogram
$A= \dfrac{d_1d_2\sin \phi}{2}$
Area
Parallelogram

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