(1)\ area:\ S=\sqrt{(s{\small-}a)(s{\small-}b)(s{\small-}c)(s{\small-}d){\small-}abcd\cos^{\small2}\frac{\theta}{2}}\\\hspace{100} s={\large\frac{a+b+c+d}{2}}\ ,\hspace{10} \theta=\theta_1+\theta_2\\\vspace{5}(2)\ perimeter:\ L=2s=a+b+c+d">
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Area of an equilateral triangle
Area of a triangle given base and height
Area of a triangle given sides and angle
Area of a triangle (Heron's formula)
Area of a triangle given base and angles
Area of a square
Area of a rectangle
Area of a trapezoid
Area of a rhombus
Area of a parallelogram given base and height
Area of a parallelogram given sides and angle
Area of a cyclic quadrilateral
Area of a quadrilateral
Area of a regular polygon
Side of polygon given area
Area of a circle
Radius of circle given area
Area of a circular sector
Area of an arch given angle
Area of an arch given height and radius
Area of an arch given height and chord
Area of an ellipse
Area of an elliptical sector
Area of an elliptical arch
Area of a parabolic arch
Area of a hyperbolic sector
Area of a hyperbolic arch
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