Conics as envelopes of straight lines.
Drag sliders to show the straight lines. Drag the point B and C around. Activate box to show the envelope. Use button to switch between a 'Parabola' or 'Ellipse/Hyperbola'.
Drag sliders to show the straight lines. Drag the point B and C around. Activate box to show the envelope. Use button to switch between a 'Parabola' or 'Ellipse/Hyperbola'.