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.
While it may be common, it does not always mean the same thing for everybody. Dreaming about your teeth falling out can mean several different things. Usually when you dream about teeth falling out, you have anxiety over something. Maybe you are worried about getting older, saying something you shouldn't have, your appearance to others, or being embarrassed in front of others.