👉 In mathematics, a curvilinear curve is any type of curve that can be defined by an equation involving two or more variables. Curves in two dimensions are called straight lines and curves in three dimensions are called ellipses (parabolas), paraboloids, hyperboloids, or cylinders. Curvilinear curves can be described using parametric equations, which allow for the definition of a curve with respect to an arbitrary parameter t. These equations involve the parameters x(t) and y
