Line from Chordís intersection with Directrix

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If CD is a chord of a parabola and E its intersection with the directrix, then BE externally bisects the angle CBD.

Expressions

Name Input
Angle 2 Derive Input Maple Input MathML Input Mathematica Input Maxima Input Mupad Input TI-Nspire Input text Input Image
Angle 1 Derive Input Maple Input MathML Input Mathematica Input Maxima Input Mupad Input TI-Nspire Input text Input Image