Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p><img src="https://i.stack.imgur.com/zMsoz.png" width="400" ></p> <pre><code>Phi= ArcTan[ Sqrt[4 * R^2 - d^2] /d ] </code></pre> <p>HTH!</p> <p><b>Edit</b></p> <p>For two different radii: </p> <p><img src="https://i.stack.imgur.com/1VxWW.png" width="400" ></p> <p>Simplifying a little: </p> <pre><code>Phi= ArcTan[Sqrt[-d^4 -(R1^2 - R2^2)^2 + 2*d^2*(R1^2 + R2^2)]/(d^2 +R1^2 -R2^2)] </code></pre> <p><strong>Edit</strong> </p> <p>If you want the angle viewed from the other circle center, just exchange R1 by R2 in the last equation. </p> <p>Here is a sample implementation in Mathematica: </p> <pre><code>f[center1_, d_, R1_, R2_] := Module[{Phi, Theta}, Phi= ArcTan[Sqrt[-d^4-(R1^2-R2^2)^2 + 2*d^2*(R1^2 + R2^2)]/(d^2 +R1^2 -R2^2)] Theta=ArcTan[Sqrt[-d^4-(R1^2-R2^2)^2 + 2*d^2*(R1^2 + R2^2)]/(d^2 -R1^2 +R2^2)] {Circle[{center1, 0}, R1, {2 Pi - Phi, Phi}], Circle[{d, 0}, R2, {Pi - Theta, -Pi + Theta}]} ]; Graphics[f[0, 1.5, 1, 1]] </code></pre> <p><img src="https://i.stack.imgur.com/EyDsY.png" alt="alt text"></p> <pre><code>Graphics[f[0, 1.5, 1, 3/4]] </code></pre> <p><img src="https://i.stack.imgur.com/dZ7pQ.png" alt="alt text"> </p> <p>And...</p> <pre><code>ImageMultiply[ Binarize@FillingTransform[#], ImageResize[Import@ "http://i305.photobucket.com/albums/nn235/greeneyedgirlox/blondebabybunny.jpg", ImageDimensions@#]] &amp;@ Rasterize@Graphics[f[0, 1.5, 1, 1], Background -&gt; Black] </code></pre> <p><img src="https://i.stack.imgur.com/CT0IE.png" alt="alt text"></p> <p>:) </p>
    singulars
    1. This table or related slice is empty.
    1. POHow to join overlapping circles?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USDr. belisarius
    1. USDr. belisarius
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POHow to join overlapping circles?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThe two radii aren't necessarily the same.
      singulars
      1. PO
      1. USIgnacio Vazquez-Abrams
    2. CO@Ignacio See edit
      singulars
      1. PO
      1. USDr. belisarius
    3. COWhats with D? How do I get D? Why is it floating around somewhere in the edit?
      singulars
      1. PO
      1. USCobra_Fast
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload