Relationship between inner and outer radius of a two concentric circles

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  • Thread starter otlconcepts
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  • #1
otlconcepts
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If i have two circles that say 24" apart from each other. one inside the other.
and i know the radius of the inside circel, how can i calculate the outside radius
 

Answers and Replies

  • #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 $r_1$.
 
Last edited:
  • #3
MarkFL
Gold Member
MHB
13,302
6
Hello, and welcome to MHB! :)

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:

\(\displaystyle R-r=k\)

mhb_0015.png
 

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