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You should upgrade or use an alternative browser. In a right-angled triangle with sides a, b and hypotenuse c,

The area is

√ (s(s-a)(s-b)(s-c))

Or

a*b/2

... and these will be equal, and the difference zero. This works for a 3,4,5 triangle, but, in the example below they are both correctly calculated as 35, but the difference is wrong.

Any ideas?

a = √(35)

b = 2√35

c = √(a^2 + b^2)

s = (a+b+c)/2

√ (s(s-a)(s-b)(s-c))-a*b/2‎ = 1.1×10⁻³¹

d=√(s(s-a)(s-b)(s-c))

D

f = a*b/2

f

d-f‎ = 1.1×10⁻³¹