Conic section: hyperbola. An hyperbola is formed when a plane intersects a cone at an angle less the the cone side makes with the cone axis. It is a double, open ended curve. In this image, the plane is at right angles to the base of the cone.
Illustration ID: MATHS-CONICS-hyperbola-5
Russell Kightley
Illustration size: 25.0 Mpixels (71.5 MB uncompressed) - 5000x5000 pixels (16.7x16.7 in / 42.3x42.3 cm at 300 ppi)