Length of line from center to tangent parallel with focal radius

Download Geometry Expressions File

Draw a line from the center of the ellipse to the tangent, parallel to the focal radius (line from the focus to the point of tangency). We see this has length equal to the semi major axis. Hence its locus is a circle.

Expressions

Name Input
Length of ED Eq Derive Input Maple Input MathML Input Mathematica Input Maxima Input Mupad Input TI-Nspire Input text Input Image
Circle D Eq Derive Input Maple Input MathML Input Mathematica Input Maxima Input Mupad Input TI-Nspire Input text Input Image