# Midline, amplitude, and period review

Review the basic features of sinusoidal functions: midline, amplitude, and period.

## What are midline, amplitude, and period?

Midline, amplitude, and period are three features of sinusoidal graphs.
start color maroonC, M, i, d, l, i, n, e, end color maroonC is the horizontal line that passes exactly in the middle between the graph's maximum and minimum points.
start color greenD, A, m, p, l, i, t, u, d, e, end color greenD is the vertical distance between the midline and one of the extremum points.
start color purpleC, P, e, r, i, o, d, end color purpleC is the distance between two consecutive maximum points, or two consecutive minimum points (these distances must be equal).