Parabola

Frae Wikipedia
Lowp tae: navigation, rake
Pairt o a parabola (in turquoise), shawin various featurs (ither colours). The complete parabola haes na endpynts. In this orientation, it extends infinitely upward an tae the left an richt.

A parabola (/pəˈræbələ/; plural parabolas or parabolae, adjective parabolic, frae Greek: παραβολή) is a twa-dimensional, mirror-symmetrical curve, which is approximately U-shaped when orientit as shawn in the diagram, but which can be in ony orientation in its plane. It fits ony o several superficially different mathematical descriptions which can aw be proved tae define curves o exactly the same shape.