Respuesta :

tonb
The area of a triangle is found by multiplying the base by the height. Problem is, that in this example with 3 different sides, you can't easily find out the height. 

To the rescue comes Heron's formula:

[tex]s = \frac{a+b+c}{2} [/tex]

and

[tex]A = \sqrt{s(s-a)(s-b)(s-c)}[/tex]

So s = (25+26+21)/2 = 36

and Area = √36·11·10·15 ≈ 243.7

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