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heron's formula

Answer 1

Answer:

10 is the right answer ok please follow me Mark me brainlist please put a thanks

Answer 2

Answer:

$\sqrt{84} \: cm$

Step-by-step explanation:

$a = 4cm \: b = 5cm \: c = 5cm$

Heron's formula :

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

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

$= \frac{4 + 5 + 5}{2}$

$= \frac{14}{2}$

$s = 7cm$

$by \: applying \: formula \: \sqrt{7(7 - 4)(7 - 5)(7 - 5)}$

$\sqrt{7 \times 3 \times 2 \times 2}$

$\sqrt{84} \: cm$

I hope this helps you!