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.
Your personal associations to the thing you lose will clue you into the emotional meaning and interpretation of your dream. To dream that you are lost suggests that you have lost your direction in life or that you have lost sight of your goals. You may be feeling worried and insecure about the path you are taking in life. If you try to call for help, then it means that you are trying to reach out for support.