3 years ago

B. Calculate the radius of Circle B if the circumference is 94.2 square centimeters.

1 answer:

6 0

$\bf \textit{circumference of a circle}\\\\ C=2\pi r~~ \begin{cases} r=radius\\ \cline{1-1} C=94.2 \end{cases}\implies 94.2=2\pi r\implies \cfrac{94.2}{2\pi }=r\implies \stackrel{\pi =3.14}{15 = r}$

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A circle is centered at (−4, −6) and has a radius of 3. Which of the following is the equation for this circle? (6 points)

ANTONII [103]

$\bf \textit{equation of a circle}\\\\ 
(x- h)^2+(y- k)^2= r^2
\qquad 
center~~(\stackrel{-4}{ h},\stackrel{-6}{ k})\qquad \qquad 
radius=\stackrel{3}{ r}
\\\\\\\
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