Teaching Year 10 about the equation of a tangent to a circle at a given point I have created a Desmos page. I have also created a Diagnostic Questions Quiz using questions on circles (centre the origin) from Diagnostic Questions.
(pdf: quation of a Circle & Gradient of Tangent)
(Also added to GCSE New Content page)
Further Desmos Updates
An early introduction – plot some points and functions
Desmos – points & functions (for PowerPoint file)
Graphs-GCSE for PowerPoint file