Hemisphere is the exact half of a sphere. When a plane cuts across a sphere at its center, it forms two hemispheres. Surface area of a hemisphere of radius r is given by 2pr2. Volume of a hemisphere of radius r is given by 2/3pr3.
Falling dreams also often reflect a sense of failure or inferiority in some circumstance or situation. It may be the fear of failing in your job/school, loss of status, or failure in love. You feel shameful and a lost sense of self-esteem You are unable to keep up with the status quo and feel that you don't measure up.
If you fall off the bridge and into the water, then the dream indicates that you are letting negative thoughts and emotions prevent you from moving forward. To dream of fearing crossing a bridge may reflect a a fear of change, moving, or failing during a critical moment. A fear of moving forward in life.