Ordinate of Point on Arch is the ordinate of any point along the central line of the arch. It basically gives the Equation for a three-hinged Parabolic arch. And is denoted by yArch. Ordinate of Point on Arch is usually measured using the Meter for Length. Note that the value of Ordinate of Point on Arch is always positive. Typically, the value of Ordinate of Point on Arch is greater than 0.