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2 years ago

The circumference of a circle can be found using the c = 2πr. use the formula to solve for the radius of a circle, r

Mathematics

2 answers:

solong [7]2 years ago

8 0

Answer:A) r= C over 2 pie

Step-by-step explanation:

Given: The circumference of a circle can be found using the $C=2\pi r$

To solve the above equation for radius of the circle 'r', first divide $2\pi$ on both sides of the equation, we get

$r=\dfrac{C}{2\pi}$

Hence, the formula to calculate radius 'r' is the circle will be : $r=\dfrac{C}{2\pi}$

julsineya [31]2 years ago

5 0

$\bf \textit{circumference of a circle}\\\\
C=2\pi r~\hspace{12em}\cfrac{C}{2\pi }=r$

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2 years ago

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$\bf \textit{equation of a circle}\\\\ 
(x- h)^2+(y- k)^2= r^2
\qquad 
center~~(\stackrel{}{ h},\stackrel{}{ k})\qquad \qquad 
radius=\stackrel{}{ r}\\\\
-------------------------------\\\\
(x+1)^2+y^2=36\implies [x-(\stackrel{h}{-1})]^2+[y-\stackrel{k}{0}]^2=\stackrel{r}{6^2}~~~~
\begin{cases}
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$\bf ~~~~~~~~~~~~\textit{distance between 2 points}
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(\stackrel{x_1}{-1}~,~\stackrel{y_1}{0})\qquad 
A(\stackrel{x_2}{-1}~,~\stackrel{y_2}{1})\qquad \qquad 
% distance value
d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2}
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$\bf ~~~~~~~~~~~~\textit{distance between 2 points}
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(\stackrel{x_1}{-1}~,~\stackrel{y_1}{0})\qquad 
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