Question

The sides of a triangle are 3 cm, 4 cm and 5 cm. Its area is
(a) 12 cm
(b) 15 cm
(c) 6 cm (d) 9 cm
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Answer 1

Answer:

12 cm is the answer please mark the answer as the brainliest and verified

Answer 2

Answer:

$\huge{\boxed{\boxed{\colorbox{pink}{❥︎Answer}}}}$

$a = 6 {cm}^{2}$

➪➪let's find out:-✍︎✍︎

✰✰using the formula:-✰✰

$= = > a=\sqrt{s(s - a)\:(s - b)\:(s - c)}$

$= = > s = \frac{a + b + c}{2}$

solve for A:-

$a = \frac{1}{4} \sqrt{ - {a}^{2} \: + 2 ({ab})^{2} + 2 ({ac})^{2} \: { - b}^{4} + 2( {bc})^{2} - {c}^{4} }$

$\frac{1}{4}. \sqrt{ {3}^{4} + 2.( {3 \times 4}^{4} ) + 2.( {3 \times 5}^{2} ) - {4}^{4} + 2.( {4 \times 5}^{2}) - {5}^{4} }$

$= 6 {cm}^{2}$