An interactive geogebra applet that aids modelling calculating the equation of a tangent to a circle. Use the slider to set the centre (differentiated with (0,0) or non (0,0) centres) and generate an example using the button. Show the working by clicking on the button and then click each line of working to reveal the next line. A differentiate worksheet is also attached with solutions. The geogebra applet is attached but if you don’t have it installed then the web link is also attached so you ca