AS/A2 Pure 1 Pure 2

P3 Topic 2: Coordinate geometry in the (x, y) plane
Tangents and normals
Tangent and normal lines to the parabola y2=4ax are displayed in red. Change the value of a to alter the curve and change t to move the tangent and normal lines round the curve.

Summary Note that the tangent and normal lines should be perpendicular to each other, but this will only appear correctly if the scales on both axes are identical. Based on free Java applets from JavaMath