- #1

otlconcepts

- 1

- 0

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

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- MHB
- Thread starter otlconcepts
- Start date

- #1

otlconcepts

- 1

- 0

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

- #2

Joppy

MHB

- 287

- 22

Did you draw a picture?

[TIKZ]

\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] {$r_1$};

[/TIKZ]

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

[TIKZ]

\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] {$r_1$};

[/TIKZ]

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

Last edited:

- #3

MarkFL

Gold Member

MHB

- 13,302

- 6

Suppose \(r\) is the radius of the inner circle and \(R\) is the radius of the inner circle, where \(k\) is the difference between the two radii:

\(\displaystyle R-r=k\)

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