The universal chord length formula is chord length = │ x1-x2 │√ (k2+1) = │ y1-y2 │√ [(1k2)+1]. Where k is that slope of the line. ab=√(x 1-x2)^2+(kx 1-kx2)^2=√(x 1-x2)^2+k^2(x 1-x2)^2=√( 1+k^2)*│x 1-x2│。

Generalization of formula

In mathematics, a formula refers to a formula that uses mathematical symbols or words to express the relationship between quantities, which is universal and suitable for all similar problems. Other applications refer to ways and methods that can be applied to similar things. General format, expressed by mathematical symbols, the formula of a certain relationship between various quantities (such as laws or theorems) can be applied to the methods of similar things.