Described

Calculate perimeter of the circle described by a triangle with sides 478, 255, 352.

Correct answer:

p =  1539.5

Step-by-step explanation:

$$\begin{gathered} s={\displaystyle \frac{a+b+c}{2}}={\displaystyle \frac{478+255+352}{2}}=542.5 \\ r={\displaystyle \frac{abc}{4S}}={\displaystyle \frac{abc}{4\sqrt{s(s-a)(s-b)(s-c)}}}=245.02 \\ p=2\pi r=1539.5 \end{gathered}$$

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