- #1

Bruno Tolentino

- 97

- 0

This formula needs of 6 values (a,b,c,d,p,q):

OBS:

**s = (a+b+c+d)/2**

And this formula needs of just 4 (a,b,c,d):

**
**

But, I tested this second formula in the geogebra and it don't works...

Sources:

http://en.wikipedia.org/wiki/Trapezoid#Area

http://en.wikipedia.org/wiki/Quadrilateral#Non-trigonometric_formulas

https://en.wikipedia.org/wiki/Bretschneider's_formula#Related_formulas