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] /351  DispNum  
[1] 2019/06/24 13:15 Male / 20 years old level / A homemaker / Very /
 Purpose of use
 to find area of fields
[2] 2019/06/13 13:26 Male / 20 years old level / Elementary school/ Junior highschool student / Very /
 Purpose of use
 Use for land
[3] 2019/06/05 11:14 Male / Under 20 years old / Highschool/ University/ Grad student / Useful /
 Purpose of use
 To figure out land plot size
[4] 2019/05/20 20:33 Male / 30 years old level / Selfemployed people / Useful /
 Purpose of use
 TO FIND THE AREA OF OUR LAND.
[5] 2019/04/23 03:55 Male / Under 20 years old / Elementary school/ Junior highschool student / A little /
 Purpose of use
 Trying to do schoolwork
[6] 2019/04/03 03:50 Male / 20 years old level / An office worker / A public employee / Very /
 Purpose of use
 Lot Size Calcs
 Comment/Request
 Perfect
[7] 2019/03/25 14:45 Male / 20 years old level / Highschool/ University/ Grad student / Very /
 Purpose of use
 For calculation of area of a plot
[8] 2019/03/08 08:02 Male / 60 years old level or over / An engineer / Useful /
 Purpose of use
 Check a surveyor's work.
 Comment/Request
 It would be great if the drawing scaled to the sides and angles being inputted.
[9] 2019/03/04 14:16 Male / 50 years old level / A retired person / Very /
 Purpose of use
 To calculate land area
 Comment/Request
 Request: Place the data entry fields on (or along) the picture.
[10] 2019/01/29 06:53 Male / Under 20 years old / Elementary school/ Junior highschool student / Very /
 Purpose of use
 to help me do my math and thank you for making this website
Thank you for your questionnaire.
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