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161.
Parallelogram perimeter
$P=2a+2b$
Parallelogram
Perimeter
162.
Area of parallelogram
$A=ah$
Area
Parallelogram
163.
Area of parallelogram
$A=ab\sin\alpha$
Area
Parallelogram
164.
Area of parallelogram
$A= \dfrac{d_1d_2\sin \phi}{2}$
Area
Parallelogram
165.
Sum of angles
$\alpha + \beta = 90^\degree$
Rhombus
Angle
166.
$d_1^2+d_2^2=4a^2$
Diagonal
Rhombus
167.
Rhombus height
$h=a\sin\alpha$
Height
Rhombus
168.
Rhombus height
$h=\dfrac{d_1d_2}{2a}$
Height
Rhombus
169.
Rhombus incircle radius
$r=\dfrac{h}{2}$
Incircle r
Rhombus
170.
Rhombus incircle radius
$r=\dfrac{d_1d_2}{4a}$
Incircle r
Rhombus
171.
Rhombus incircle radius
$r=\dfrac{a\sin\alpha}{2}$
Incircle r
Rhombus
172.
Rhombus perimeter
$P=4a$
Perimeter
Rhombus
173.
Rhombus area
$A=ah$
Rhombus
Area
174.
Rhombus area
$A=\dfrac{d_1d_2}{2}$
Area
Rhombus
175.
Rhombus area
$A=a^2\sin\alpha$
Area
Rhombus
176.
$\lim_{x\to 0} \dfrac{\sin x}{x}=1$
Limit
Trigonometry
177.
$\lim_{x \to 0} \dfrac{1-\cos x}{x}=0$
Limit
Trigonometry
178.
$\lim_{x \to 0} \dfrac{1-\cos x}{x^2}=\dfrac{1}{2}$
Limit
Trigonometry
179.
$\lim{x \to 0} \dfrac{\tan x}{x}=1$
Limit
Trigonometry
180.
$\lim{x \to 0} \dfrac{\tan ax}{bx}=\dfrac{a}{b}$
Limit
Trigonometry

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