Area of a quadrilateral Calculator
Calculates the area and perimeter of a quadrilateral given four sides and two opposite angles. 


\(\normalsize Bretschneider's\ formula \\ (1)\ area:\ S=\sqrt{(s{\small}a)(s{\small}b)(s{\small}c)(s{\small}d){\small}abcd\cos^{\small2}\frac{\theta}{2}}\\ \hspace{100px} s={\large\frac{a+b+c+d}{2}}\ ,\hspace{10px} \theta=\theta_1+\theta_2\\ (2)\ perimeter:\ L=2s=a+b+c+d\) 

Area of a quadrilateral
[110] /397  DispNum  
[1] 2021/04/16 04:23 Male / 30 years old level / An office worker / A public employee / Very /
 Purpose of use
 Verify square footage of a lot I am looking to build a house on.
 Comment/Request
 Very helpful, thank you!
[2] 2021/03/27 05:21 Female / 50 years old level / Selfemployed people / Very /
 Purpose of use
 Find the area of a wedge shaped lot for my real estate business.
 Comment/Request
 Great asset to have online. Will likely use again. Thanks for making this available.
[3] 2021/03/23 22:10 Male / 40 years old level / An office worker / A public employee / Very /
 Purpose of use
 Measure area in yard where I want to put pavers
[4] 2021/02/12 08:19 Male / 40 years old level / Highschool/ University/ Grad student / Very /
 Purpose of use
 Finding the most allpurpose formula for use in a spreadsheet. This is a great resource!
[5] 2021/02/06 03:03 Male / 60 years old level or over / An engineer / Very /
 Purpose of use
 Land survying.
[6] 2021/01/27 13:25 Female / 50 years old level / Others / Useful /
 Purpose of use
 Calculate pastures of farm for Gypsum application
[7] 2021/01/20 04:11 Female / 60 years old level or over / A retired person / Very /
 Purpose of use
 To calculate the area of an empty lot for building purposes
[8] 2021/01/08 20:33 Female / 60 years old level or over / A retired person / Very /
 Purpose of use
 Calculation of area of proposed park for local sailing club
[9] 2021/01/08 00:58 Male / 40 years old level / Others / Very /
 Purpose of use
 Determine total sqft of an odd shaped treehouse for structural/material weights calculation
[10] 2020/12/19 06:05 Male / Under 20 years old / Elementary school/ Junior highschool student / Very /
 Purpose of use
 I need have some grades before christmas break or i get no presents and instead a whoopin
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