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#### otlconcepts

##### New member

- May 15, 2020

- 1

and i know the radius of the inside circel, how can i calculate the outside radius

- Thread starter otlconcepts
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- Thread starter
- #1

- May 15, 2020

- 1

and i know the radius of the inside circel, how can i calculate the outside radius

Did you draw a picture?

\begin{tikzpicture}

\draw[thick,red] (0,0) circle (4);

\draw[->,thick,red] (0,0) -- (4, 0) node[below, xshift=-1cm] {$r_2$};

\draw[thick,blue] (0,0) circle (2);

\draw[->, thick, blue] (0,0) -- (2, 0) node[below, xshift=-0.75cm] {$r_1$};

\end{tikzpicture}

$r_2 - r_1 = 24"$ right? And you know $r_1$.

\begin{tikzpicture}

\draw[thick,red] (0,0) circle (4);

\draw[->,thick,red] (0,0) -- (4, 0) node[below, xshift=-1cm] {$r_2$};

\draw[thick,blue] (0,0) circle (2);

\draw[->, thick, blue] (0,0) -- (2, 0) node[below, xshift=-0.75cm] {$r_1$};

\end{tikzpicture}

$r_2 - r_1 = 24"$ right? And you know $r_1$.

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