Question

Va rog mult urgeeeentt

Answer 1

Răspuns:

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

Answer 2

Răspuns:

Formula lui Herone:

$\sqrt{p(p - a)(p - b)(p - c)}$

p=

$\frac{a + b + c}{2}$

p= (26+28+30)/2

p=84/2

p=42

A(ABC) =analog Formula lui Herone

$\sqrt{42(42 - 26)(42 - 28)(42 - 30)}$

$\sqrt{42 \times 16 \times 14 \times 12}$

$\sqrt{112896}$

$336cm {}^{2}$