Heronian triangles: in wolfram.com

[זקיר סעידוב - ד\"ר/Zakir Seidov Ph.D.]

Dear SeqFans,

Could anyone kindly check the formulas of
Heronian triangles in:

http://mathworld.wolfram.com/HeronianTriangle.html

one of sides, "c", equals the area "delta",

please email 
(not bothering all Fans) 
me in person,

thanks,
Zak