Variables

a
→
Side of a rhombus
d1, d2
→
Diagonals
α, β
→
Angles
h
→
Height
r
→
Inscribed circle radius
P
→
Perimeter
A
→
Area
1.
Sum of angles
$\alpha + \beta = 90^\degree$
Rhombus
Angle
2.
$d_1^2+d_2^2=4a^2$
Diagonal
Rhombus
3.
Rhombus height
$h=a\sin\alpha$
Height
Rhombus
4.
Rhombus height
$h=\dfrac{d_1d_2}{2a}$
Height
Rhombus
5.
Rhombus incircle radius
$r=\dfrac{h}{2}$
Incircle r
Rhombus
6.
Rhombus incircle radius
$r=\dfrac{d_1d_2}{4a}$
Incircle r
Rhombus
7.
Rhombus incircle radius
$r=\dfrac{a\sin\alpha}{2}$
Incircle r
Rhombus
8.
Rhombus perimeter
$P=4a$
Perimeter
Rhombus
9.
Rhombus area
$A=ah$
Rhombus
Area
10.
Rhombus area
$A=\dfrac{d_1d_2}{2}$
Area
Rhombus
11.
Rhombus area
$A=a^2\sin\alpha$
Area
Rhombus

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