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] /424Disp-Num
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    [1]  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.
    [2]  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.
    [3]  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
    [4]  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
    [5]  2022/07/26 00:54   60 years old level or over / A retired person / Very /
    Purpose of use
    Needed to calculate area for re-sod.
    Comment/Request
    Qaudrilateral is tricky and needed sq footage to order material, yard waste, and labor. Great tool! Thanks!
    [6]  2022/06/08 20:47   50 years old level / A retired person / Very /
    Purpose of use
    Used to calculate a patio area and lawn area in our back garden.
    Comment/Request
    Excellent tool. Thank you.
    [7]  2022/06/08 08:49   60 years old level or over / Self-employed people / Useful /
    Purpose of use
    Land area calculation
    Comment/Request
    Providing the answer in acreage would be helpful.
    [8]  2022/05/25 07:22   40 years old level / An office worker / A public employee / Very /
    Purpose of use
    Using it to calculate the area of a property based on perimeter measurements, then convert to acres.
    [9]  2022/04/27 14:00   40 years old level / An engineer / Very /
    Purpose of use
    Calculate turf in front yard. Excellent. For triangular plots, use a very small dimension for one side.
    [10]  2022/04/08 07:05   50 years old level / Self-employed people / Very /
    Purpose of use
    working out the area of small front garden to be turfed
    Comment/Request
    thankyou

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