Area of a quadrilateral Calculator

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

Area of a quadrilateral
side a
side b
side c
side d
sum of angles θ12

area S
    1.  
perimeter L
    1.  
    Area of a quadrilateral
    [1-10] /430Disp-Num
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    [1]  2023/04/21 16:15   30 years old level / An engineer / Useful /
    Purpose of use
    Calculate an area of land
    [2]  2023/04/08 05:20   50 years old level / A retired person / Very /
    Purpose of use
    To calculate the area of a parcel of land.
    [3]  2023/03/23 07:24   20 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    Area of lease space
    [4]  2023/03/09 03:28   Under 20 years old / High-school/ University/ Grad student / A little /
    Purpose of use
    check answer
    [5]  2023/02/20 02:22   Under 20 years old / High-school/ University/ Grad student / Very /
    Purpose of use
    checking whether my calculations on a math test were correct
    [6]  2023/02/13 21:22   20 years old level / An engineer / Useful /
    Purpose of use
    To calculate area of a Plot of land with all different sides without having data of angles.
    [7]  2023/01/04 23:49   60 years old level or over / A retired person / Very /
    Purpose of use
    Calculating area regarding how much compost needed to cover it.
    [8]  2022/11/17 00:53   60 years old level or over / A retired person / Very /
    Purpose of use
    needed to calculate the sq ft of a sloping retaining wall on an incline. Seven walls in total.
    Comment/Request
    Before using this "tool", I measured height of both ends and the middle of each wall and multiplied by length. With this formula, I saved over 15 sq. ft. of material from my initial calculation.
    [9]  2022/11/12 02:11   30 years old level / An engineer / Very /
    Purpose of use
    Land lot area calculation with unequal lengths
    Comment/Request
    Very useful
    [10]  2022/08/19 05:40   60 years old level or over / A retired person / Useful /
    Purpose of use
    Calculate irregular lot size accurately for sales and marketing records

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