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Răspuns:

[tex]Sp=\frac{26+28+30}{2} =>Sp=\frac{84}{2} =>Sp=42\\\\\\A=\sqrt{p(p-a)(p-b)(p-c)} \\\\A=\sqrt{42(42-26)(42-28)(42-30)} =>A=\sqrt{112896} =>A=336 cm^{2}[/tex]

Răspuns:

Formula lui Herone:

[tex] \sqrt{p(p - a)(p - b)(p - c)} [/tex]

p=

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

p= (26+28+30)/2

p=84/2

p=42

A(ABC) =analog Formula lui Herone

[tex] \sqrt{42(42 - 26)(42 - 28)(42 - 30)} [/tex]

[tex] \sqrt{42 \times 16 \times 14 \times 12} [/tex]

[tex] \sqrt{112896} [/tex]

[tex]336cm {}^{2} [/tex]