# Area of a quadrilateral Calculator

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

 side a side b side c side d sum of angles θ1+θ2 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit area S perimeter L
 $\normal Bretschneider's\ formula \\\vspace{5}(1)\ area:\ S=\sqrt{(s{\small-}a)(s{\small-}b)(s{\small-}c)(s{\small-}d){\small-}abcd\cos^{\small2}\frac{\theta}{2}}\\\hspace{100} s={\large\frac{a+b+c+d}{2}}\ ,\hspace{10} \theta=\theta_1+\theta_2\\\vspace{5}(2)\ perimeter:\ L=2s=a+b+c+d$

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[1]  2019/04/23 03:55   Male / Under 20 years old / Elementary school/ Junior high-school student / A little /
Purpose of use
Trying to do schoolwork
[2]  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
[3]  2019/03/25 14:45   Male / 20 years old level / High-school/ University/ Grad student / Very /
Purpose of use
For calculation of area of a plot
[4]  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.
[5]  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.
[6]  2019/01/29 06:53   Male / Under 20 years old / Elementary school/ Junior high-school student / Very /
Purpose of use
to help me do my math and thank you for making this website
[7]  2019/01/16 06:24   Female / Under 20 years old / High-school/ University/ Grad student / Not at All /
Purpose of use
Math
Comment/Request
this just confused me more than it helped lol
[8]  2019/01/10 00:25   Female / 30 years old level / Self-employed people / Very /
Purpose of use
planning
[9]  2019/01/06 10:11   - / 60 years old level or over / A retired person / Very /
Purpose of use
Personal land PLAT area calc
[10]  2018/12/03 09:34   Male / Under 20 years old / Elementary school/ Junior high-school student / Very /
Purpose of use
Homework

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