Question

To figure out the height of a wave you measure the distance between the crest and what?

Answer 1

trough

The figure above also shows how the size of waves is measured   Figure above  . The highest point of a wave is the crest . The lowest point is the trough . The vertical distance between a crest and a trough is the wave height . Wave height is also called amplitude . The horizontal distance between two crests is the wavelength . Both amplitude and wavelength are measures of wave size.