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Factoring and product formulas
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Circle
Triangles
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Various
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Factoring and product formulas
Quadratic equations
Progressions
Trigonometry
Probability theory
Statistics
Circle
Triangles
Quadrangles, polygons
Shape Areas
Solid figures
Equations of geometric shapes
Various
Combinatorics
Vectors
Logarithms

Math formulas
Shape Areas
Area of a rectangle using diagonal

Area of a rectangle using diagonal

$S = \frac{1}{2}\cdot d^{2}\cdot sin(\phi)$

d - diagonal
φ - angle between diagonals

Find

S
d
φ

It is known that:

=

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arc sin

arc cos

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