Is right triangle or not

If right triangle ABC, have sides a=13, b=11.5, c=22.5. Find area.

Correct result:

A =  54.4151

Solution:

a=13 b=11.5 c=22.5  c1=a2+b2=132+11.52≐17.3566 c1<>c  s=a+b+c2=13+11.5+22.52=472=23.5  A=s⋅ (s−a)⋅ (s−b)⋅ (s−c)=23.5⋅ (23.5−13)⋅ (23.5−11.5)⋅ (23.5−22.5)=3 329=54.4151

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