Displacement s=vt, or displacement per unit time = speed per unit time x. To find its displacement, that is, to find the area of V/T image, a simple geometric method can be used to find a uniform change or a uniform straight line. Triangular lines, rectangles, trapezoids, and X-height at the bottom are variable acceleration movements, so the mathematical content of F(X)=f(x)' can be found by calculus.