Answer:
Step-by-step explanation:
if we were to find the distance of GD , that would be in the plane of GB so then we could just treat GB as a normal right triangle soo
GD = sqrt ( 20^2 + 9^2 )
GD = 21.9317122
GB = sqrt ( GD^2 + 8^2 )
GB = 23.34523,,,
23.3 looks good
