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Lubov Fominskaja [6]
3 years ago
7

Please help!!

Mathematics
1 answer:
Pani-rosa [81]3 years ago
3 0

Answer:

the answer is B, x=7

Step-by-step explanation:

heron's area formula:

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

area =  \sqrt{s(s - a)(s - b)(s - c)}

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