Definitions for "Glide ratio"
distance travelled along track divided by height lost, unpowered, in still air
Powered paragliders typically offer power off glide ratios in the 7 to 1 range. That means for every 7 feet you move forward, you drop one foot in altitude. This number will vary based on wing styles.
angle at which glider descends through air. Determined by how much lift and drag a particular wing produces.