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1.
Equilateral triangle area
$A=\dfrac{ah}{2}$
2.
Equilateral triangle area
$A=\dfrac{a^2\sqrt3}{4}$
3.
Isoscales triangle area
$A=\dfrac{ah}{2}$
4.
Isoscales triangle area
$A=\dfrac{b^2}{2}\sin\alpha$
5.
Area of a square
$A = a^2$
6.
Rectangle area
$A=ab$
7.
Area of parallelogram
$A=ah$
8.
Area of parallelogram
$A=ab\sin\alpha$
9.
Area of parallelogram
$A= \dfrac{d_1d_2\sin \phi}{2}$
10.
Rhombus area
$A=ah$
11.
Rhombus area
$A=\dfrac{d_1d_2}{2}$
12.
Rhombus area
$A=a^2\sin\alpha$
13.
Right triangle area
$A=\dfrac{ab}{2}$
14.
Right triangle area
$A=\dfrac{ch}{2}$
15.
Tirangle area - verison 1
$A=\dfrac{ah_a}{2}$
16.
Triangle area - version 2
$A = \dfrac{ab\sin\gamma}{2}$
17.
Hereons Formula for triangle area
$A = \sqrt{p(p-a)(p-b)(p-c}, \text{ where } p = \dfrac{a+b+c}{2}$
18.
Triangle area - version 3
$A= pr, \text{ where } p = \dfrac{a+b+c}{2}$
19.
Triangle area - version 5
$A = 2R^2\sin\alpha \sin\beta \sin\gamma$
20.
Tirangle area - version 6
$A = p^2 \tan\dfrac{\alpha}{2}\tan\dfrac{\beta}{2}\tan\dfrac{\gamma}{2}$