Drag the centers to rearrange the circles - or use the table below to control location and curvature/radius. Try some Apollonian Gaskets of your own - and try the Quiz!

Hint: When entering mathematical expressions in the math boxes below (f(x), g(x) and h(x)), use the space key to step out of fractions, powers, etc. On Android, begin entry by pressing Enter.

Type simple mathematical expressions and equations as you would normally enter these: for example, "x^2[space]-4x+3", and "2/3[space]". For more interesting elements, use Latex notation (prefix commands such as "sqrt" and "nthroot3" with a backslash (\)): for example: "\sqrt(2)[space][space]". Learn More?

QR Codes are a great way to share data and information with others, even when no Internet connection is available. Most modern devices either come equipped with QR readers in-built, or freely available.

The default link here is the GXWeb Kissing Circles Jigsaw, but you can use it as an alternative to sending your assessment data via email, web or share with others in your class. You can even use it to send your own messages!